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Question 1Safety Standards, Codes, and Regulations
Which standard is the primary U.S. consensus document governing safety requirements for automated vehicular gate operators and their associated entrapment protection?
- NFPA 70
- UL 325 Correct answer.
- ISO 9001
- ASHRAE 90.1
Explanation
UL 325 establishes the safety requirements for gate, door, and window operators, including the entrapment protection provisions that apply to automated vehicular gates. NFPA 70 is the electrical code, while the other documents address unrelated subject matter.
Question 2Safety Standards, Codes, and Regulations
In gate operator safety terminology, the area where a person's body, arm, or hand can be caught between the moving gate and a fixed object is called a:
- traffic lane
- control zone
- pinch point Correct answer.
- setback line
Explanation
A pinch point is any location where body parts can be caught, crushed, or pinched between the moving gate and a fixed object. Identifying and guarding pinch points is a central requirement of gate safety compliance.
Question 3Safety Standards, Codes, and Regulations
An automated gate operator is installed on a site. Which party is typically responsible for ensuring that the installed system, including entrapment protection devices, complies with the applicable safety standard after installation?
- The utility provider
- The property insurer
- The installer Correct answer.
- The gate manufacturer only
Explanation
The installing dealer or technician is responsible for the final installed configuration, including proper placement and function of entrapment protection devices. The manufacturer's listing covers the product, but site-specific compliance is the installer's obligation.
Question 4Safety Standards, Codes, and Regulations
A slide gate operator is rated for a gate that weighs more than the operator's listed capacity. What is the correct compliance response?
- Add a second warning sign near the gate
- Reduce the duty cycle to compensate
- Select an operator rated for the actual gate weight and length Correct answer.
- Lower the motor voltage to slow the gate
Explanation
Operators must be matched to the gate's weight and length within the manufacturer's listed capacity; exceeding it voids the listing and defeats the safety design. Slowing or derating the motor does not restore the listing or the required stopping forces.
Question 5Safety Standards, Codes, and Regulations
Which entrapment protection type describes a device that, when activated, causes the gate to stop and reverse, and is monitored by the operator control board?
- A manual disconnect
- A fixed warning placard
- A photo-reflective sign
- A monitored reversing edge Correct answer.
Explanation
Monitored entrapment protection devices such as reversing edges signal the operator to stop and reverse, and the operator continuously verifies the device is functioning. Warning placards and manual disconnects do not provide active reversal.
Question 6Safety Standards, Codes, and Regulations
A technician is installing a swing gate operator. Which condition requires an external entrapment protection device in addition to any inherent protection built into the operator?
- The gate opens toward a public walkway where pedestrians may be present Correct answer.
- The operator uses a chain drive
- The gate is painted a high-visibility color
- The gate is located on private property
Explanation
When the gate swing or travel can create an entrapment hazard to pedestrians, external entrapment protection is required regardless of inherent operator features. Color, drive type, and ownership do not determine the need for external protection.
Question 7Safety Standards, Codes, and Regulations
What is the primary purpose of a gate operator's inherent entrapment protection?
- To increase gate speed for traffic flow
- To limit the force the gate can exert or reverse upon sensing obstruction Correct answer.
- To lock the gate against manual movement
- To provide backup power during outages
Explanation
Inherent protection is built into the operator and limits the force applied or reverses the gate when resistance is sensed. It is not intended to speed the gate, provide backup power, or lock the gate.
Question 8Safety Standards, Codes, and Regulations
Which document typically provides the manufacturer's specific instructions for installing and adjusting entrapment protection devices on a given operator?
- The property deed
- The local building permit
- The operator installation manual Correct answer.
- The utility rate schedule
Explanation
The installation manual contains the manufacturer's required procedures, settings, and device compatibility information that the installer must follow to maintain the listing. Other documents do not contain installation instructions.
Question 9Safety Standards, Codes, and Regulations
A gate operator is installed in a location where the public can reach the gate. What signage requirement generally applies?
- Warning signs must be mounted where they are visible to persons near the gate Correct answer.
- Signs are required only inside the equipment cabinet
- Signs are optional if the gate is painted yellow
- Signs are needed only for commercial properties
Explanation
Warning signs warning of automatic gate operation and the entrapment hazard must be installed so they are visible to pedestrians and drivers approaching the gate. Placement inside a cabinet or reliance on paint does not satisfy the requirement.
Question 10Safety Standards, Codes, and Regulations
Which of the following best describes the role of a photo-eye (photoelectric) sensor in a gate system?
- It provides structural support for the gate leaf
- It detects a person or vehicle in the gate path and signals the operator to stop or reverse Correct answer.
- It regulates the supply voltage to the operator motor
- It measures the weight of vehicles crossing the gate
Explanation
A photoelectric sensor projects a beam across the gate path; interruption signals the operator to stop or reverse to prevent entrapment. It does not weigh vehicles, support the gate, or regulate voltage.
Question 11Safety Standards, Codes, and Regulations
A technician is asked to disable a reversing edge on a sliding gate because it keeps triggering. What is the compliant action?
- Repair or replace the malfunctioning device so protection remains active Correct answer.
- Leave the device disconnected and add a warning sign
- Remove the edge and rely on the operator's timer
- Increase the motor force so the gate overrides the edge
Explanation
Entrapment protection devices must remain functional; a nuisance-tripping device must be repaired, adjusted, or replaced, not bypassed. Disabling protection or increasing force to override it creates a non-compliant and unsafe condition.
Question 12Safety Standards, Codes, and Regulations
Which of the following is generally required before a technician performs work on the electrical components of a gate operator?
- Removing the warning signs
- De-energizing and locking out the circuit Correct answer.
- Opening the gate to its full travel
- Increasing the operator's force setting
Explanation
Lockout/tagout and de-energizing the circuit protect the technician from electrical and unexpected-motion hazards. Increasing force or removing signage increases risk, and gate position does not substitute for de-energizing.
Question 13Safety Standards, Codes, and Regulations
An operator's control board supports monitored entrapment protection devices. Why must the connected device be one the board can monitor?
- So the device can be powered from the gate battery
- So the gate can operate without any power source
- So the device can double as a traffic counter
- So the operator can detect a failed or disconnected device and respond safely Correct answer.
Explanation
Monitoring allows the operator to verify the device's presence and function; if the device fails or is disconnected, the operator can refuse to run or default to a safe state. Monitoring is not about battery power, off-grid operation, or traffic counting.
Question 14Safety Standards, Codes, and Regulations
Which condition most clearly indicates that a swing gate creates a potential entrapment hazard requiring mitigation?
- The gate is operated by a remote control
- The gate is located near a landscaped median
- The gate opens into an area where a person could be pinned against a wall Correct answer.
- The gate is constructed of ornamental iron
Explanation
Entrapment hazards exist where the moving gate can pin or crush a person against a fixed object such as a wall or fence. Material, control method, and landscaping are not themselves entrapment conditions.
Question 15Safety Standards, Codes, and Regulations
A gate operator's listed maximum gate length is exceeded by the installed gate. What is the most likely compliance consequence?
- The operator automatically increases its force rating
- The gate becomes exempt from signage requirements
- The entrapment protection devices become unnecessary
- The installation no longer conforms to the operator's listing Correct answer.
Explanation
Exceeding listed capacity means the operator is being used outside its certified parameters, so the installation no longer conforms to the listing. Capacity limits do not self-adjust, and they do not waive signage or protection requirements.
Question 16Safety Standards, Codes, and Regulations
Which of the following is the best example of a fixed object that can create a pinch point for a sliding gate?
- A masonry pillar at the end of the gate travel Correct answer.
- A portable traffic cone
- A pedestrian walking through the opening
- A moving vehicle in the drive lane
Explanation
A fixed object such as a pillar can trap a person between the moving gate and the structure at the end of travel. Vehicles, pedestrians, and cones are transient and are not fixed objects.
Question 17Safety Standards, Codes, and Regulations
When a gate operator is installed, which of the following records best demonstrates that entrapment protection devices were tested and adjusted at commissioning?
- A copy of the utility bill
- A signed commissioning checklist documenting device tests Correct answer.
- A verbal confirmation to the property owner
- A photograph of the gate from the street
Explanation
A documented checklist showing each device was tested and adjusted provides verifiable evidence of compliance at commissioning. Photographs, utility bills, and verbal statements do not record test results.
Question 18Safety Standards, Codes, and Regulations
Which practice best supports ongoing compliance after a gate system is placed in service?
- Removing devices that frequently trigger
- Disabling monitoring to reduce service calls
- Scheduled inspection and testing of entrapment protection devices Correct answer.
- Increasing gate speed to reduce cycle time
Explanation
Regular inspection and testing verifies that entrapment protection remains functional over time. Speed increases, device removal, and disabling monitoring all undermine safety and compliance.
Question 19Safety Standards, Codes, and Regulations
A property owner requests that a technician remove the gate's warning signs because they are unattractive. What is the appropriate response?
- Move the signs into the operator cabinet
- Remove the signs and note it on the invoice
- Replace the signs with a painted stripe on the gate
- Explain that the signs are required and must remain visible Correct answer.
Explanation
Required warning signage must remain installed and visible to persons near the gate; aesthetics do not override the requirement. Removing, substituting, or hiding signs defeats their purpose.
Question 20Safety Standards, Codes, and Regulations
Which factor most directly determines the required stopping force limits for a given gate operator installation?
- The property's landscaping budget
- The color of the gate and fence
- The operator's listed design and the applicable safety standard Correct answer.
- The number of remote controls issued
Explanation
Force limits are established by the safety standard and the operator's listed design, which the installer must not exceed. Cosmetic, access-control quantity, and budget factors do not set force limits.
Question 21Safety Standards, Codes, and Regulations
A technician finds that a gate operator has been modified with a non-listed control board. What is the primary compliance concern?
- The gate will require a larger driveway
- The modification may void the listing and defeat safety functions Correct answer.
- The gate will operate too slowly
- The warning signs will become illegible
Explanation
Field modifications using non-listed components can void the product listing and compromise entrapment protection and monitoring. Speed, signage legibility, and driveway size are not the central concern.
Question 22Safety Standards, Codes, and Regulations
Which of the following situations most likely requires the addition of a second type of entrapment protection device beyond what is already installed?
- A gate where the existing device cannot detect a person in a blind zone of travel Correct answer.
- A gate that is opened only during daytime
- A gate that uses a solar power supply
- A gate that is painted a dark color
Explanation
Where a single device leaves a blind zone that a person could occupy, additional protection is needed to cover that area. Paint color, power source, and operating hours do not by themselves create the need for an additional device type.
Question 23Safety Standards, Codes, and Regulations
A gate operator is being installed on a site governed by a local ordinance that is more stringent than the referenced national safety standard. Which requirement applies?
- The more stringent local requirement Correct answer.
- The national standard, because it supersedes local rules
- Whichever requirement the owner prefers
- Neither, because the standards conflict
Explanation
Where a local ordinance imposes stricter requirements than a referenced standard, the stricter requirement governs to provide the greater level of safety. The national standard is a floor, not a ceiling, and owner preference cannot waive safety rules.
Question 24Safety Standards, Codes, and Regulations
Why does the safety standard require that entrapment protection devices be tested at the time of installation rather than assumed to be functional?
- Because testing increases the operator's speed
- Because proper alignment, wiring, and response must be verified under actual site conditions Correct answer.
- Because devices are shipped uncharged
- Because testing eliminates the need for signage
Explanation
Site conditions such as alignment, wiring, and control response determine whether a device actually protects; testing verifies these under real conditions. Devices are not shipped uncharged, testing does not increase speed, and it does not remove signage requirements.
Question 25Safety Standards, Codes, and Regulations
Which of the following best describes how an operator should respond when a monitored entrapment protection device reports a fault?
- It should ignore the fault and continue normal operation
- It should default to a safe state that prevents hazardous motion Correct answer.
- It should disable the warning signs
- It should increase motor force to compensate
Explanation
A monitored device fault should cause the operator to enter a safe state, such as preventing or limiting hazardous motion, until the fault is corrected. Ignoring the fault, increasing force, or disabling signage would defeat the protection.
Question 26Safety Standards, Codes, and Regulations
Which organization publishes the UL 325 standard that gate operators are commonly listed to?
- Underwriters Laboratories Correct answer.
- American Society of Mechanical Engineers
- National Fire Protection Association
- International Code Council
Explanation
UL 325 is the standard for door, drapery, gate, louver, and window operators and systems, and it is published by Underwriters Laboratories. Listing to this standard is how an operator demonstrates it meets recognized safety criteria. Other organizations publish separate codes and standards, such as building or fire codes.
Question 27Safety Standards, Codes, and Regulations
In general terms, what does the UL 325 classification of a gate operator (for example, Class I through Class IV) describe?
- The color and reflectivity required for the gate finish
- The duty cycle and intended usage environment of the operator Correct answer.
- The maximum wind load the gate leaves can resist
- The voltage and phase of the electrical supply
Explanation
The UL 325 usage classes categorize operators by how heavily they are used and the type of site they serve, ranging from residential to industrial or restricted-access applications. The class informs selection of an operator appropriate to the traffic and duty demands. It does not set wind load, finish, or supply-voltage requirements.
Question 28Safety Standards, Codes, and Regulations
A technician is wiring the controls for a gate operator. Which publication is the primary electrical code that governs the installation of the branch circuit and disconnecting means?
- UL 991, the safety-related controls standard
- ASTM F2200, the gate standard
- NFPA 101, the Life Safety Code
- NFPA 70, the National Electrical Code Correct answer.
Explanation
NFPA 70, the National Electrical Code, governs the wiring methods, overcurrent protection, grounding, and disconnecting means for the electrical supply to the operator. It is the code most commonly adopted and enforced for electrical installations. The other documents address life safety, gate construction, or control reliability rather than branch-circuit wiring.
Question 29Safety Standards, Codes, and Regulations
A technician is preparing to service the line-voltage section of a gate operator. Which practice best reflects the electrical-code requirement for safely de-energizing the equipment?
- Lock out and tag the disconnecting means and verify the circuit is de-energized before working Correct answer.
- Rely on the operator's internal control-board fuse to isolate the line voltage
- Ask the property owner to switch off the breaker while the technician watches the gate
- Turn the operator off at the keypad and begin work immediately
Explanation
Safe electrical work requires isolating the circuit at the disconnecting means, applying a lock and tag, and verifying absence of voltage before contact. This protects against inadvertent re-energization and stored or mislabeled circuits. Control-level switches and fuses do not remove line voltage from all conductors.
Question 30Safety Standards, Codes, and Regulations
A site has a local ordinance and an adopted model code that differ on a gate safety requirement. How should the technician resolve the conflict when planning the installation?
- Apply whichever requirement the operator manufacturer lists first
- Apply the model code because it is nationally recognized
- Apply the more stringent of the applicable requirements Correct answer.
- Apply the ordinance only if the owner requests it in writing
Explanation
When more than one requirement applies, the stricter provision generally governs so that the higher level of safety is achieved and neither requirement is violated. The technician should confirm the adopted local amendments before work begins. Manufacturer instructions set a baseline but do not override a stricter legally adopted requirement.
Question 31Site Survey, Planning, and Layout
During a site survey for a new automated gate, which measurement most directly determines whether a sliding gate can be installed instead of a swing gate?
- The number of vehicles per hour
- The available horizontal clearance parallel to the fence line Correct answer.
- The color of the existing driveway surface
- The height of the adjacent building
Explanation
A sliding gate needs clear travel room parallel to the fence line for the leaf to slide back, so horizontal clearance along the fence is the deciding dimension. Swing gates instead require clear space perpendicular to the opening for the arc of the leaf. Other site features do not determine gate type.
Question 32Site Survey, Planning, and Layout
A site plan shows a 4 m wide driveway opening and the client wants a single-leaf swing gate. What survey value must be checked to confirm the gate can open fully?
- The depth of the driveway asphalt
- The width of the pedestrian walkway
- The clearance behind the opening for the swing arc Correct answer.
- The distance to the nearest streetlight
Explanation
A single-leaf swing gate sweeps an arc whose radius equals the leaf width, so the planner must confirm unobstructed space behind the opening. If the arc is blocked the leaf cannot reach full open position. Driveway depth, lighting, and walkway width do not control the swing.
Question 33Site Survey, Planning, and Layout
When planning cable routes for an automated gate, why is it good practice to survey for a separate low-voltage conduit from the high-voltage supply?
- To eliminate the need for an earth connection
- To keep control and signal wiring isolated from mains interference Correct answer.
- To allow the gate to operate without a control panel
- To reduce the total length of trenching required
Explanation
Separating low-voltage control and safety-device cabling from mains supply reduces electrical interference and meets common wiring practice. It does not shorten trenching or remove the need for earthing. The control panel is still required.
Question 34Site Survey, Planning, and Layout
A survey records a driveway slope of 1:8 at the gate line. What is the primary planning concern this raises for a swing gate operator?
- The gate will open faster than rated
- The safety edges become unnecessary
- The operator may struggle to move the leaf and the leaf may drift when released Correct answer.
- The hinge will require no adjustment
Explanation
Significant gradients increase the force needed to move a swing leaf and can cause the leaf to swing under its own weight when the operator disengages. Planners must account for this in operator selection and hinge setup. Slope does not increase speed or remove safety requirements.
Question 35Site Survey, Planning, and Layout
Which document should a technician produce after a site survey to guide the installation team?
- A maintenance log
- A site layout drawing with dimensions and equipment positions Correct answer.
- A warranty certificate
- An operator user manual
Explanation
The site layout drawing captures measured dimensions, equipment locations, and cable routes so the installers can work to plan. Warranty certificates, manuals, and maintenance logs are not survey outputs.
Question 36Site Survey, Planning, and Layout
What is the purpose of establishing a datum point during a gate site survey?
- To mark where the control panel will be mounted
- To record the client's preferred gate color
- To provide a fixed reference from which all measurements are taken Correct answer.
- To identify the property boundary owner
Explanation
A datum is a fixed reference point or line so that all subsequent measurements are consistent and repeatable. It is not a mounting location, a finish choice, or a boundary record.
Question 37Site Survey, Planning, and Layout
A site has a 6 m opening and the client wants a bi-folding gate. How does the required clear space behind the opening typically compare with that of a single swing leaf of the same total width?
- Bi-folding needs more depth because leaves stack outward
- Bi-folding requires no clearance at all
- Both require identical depth
- Bi-folding needs less depth because leaves fold back on themselves Correct answer.
Explanation
Bi-folding gates fold leaves back on themselves, so the depth required behind the opening is much less than the arc of a single full-width swing leaf. They still need some clearance for the folded stack. Identical or zero clearance statements are incorrect.
Question 38Site Survey, Planning, and Layout
During a survey, the technician finds a public footpath crosses the driveway immediately in front of the proposed gate line. What is the most appropriate planning response?
- Install the gate directly across the footpath for convenience
- Reduce the gate width to fit the footpath
- Position the gate so opening leaves and swept arcs do not obstruct the footpath Correct answer.
- Ignore the footpath because it is outside the property
Explanation
Gate leaves and their travel must not sweep across or block a public right of way, so the layout should be adjusted to keep the path clear. Placing the gate across the path or narrowing arbitrarily does not resolve the obstruction.
Question 39Site Survey, Planning, and Layout
A client requests safety photocells at the gate. Where should the survey plan place them for a swing gate?
- At the control panel enclosure
- On the roof of the adjacent building
- On the operator housing only
- Across the opening to detect obstructions in the leaf path Correct answer.
Explanation
Safety photocells are positioned to create a beam across the opening so an obstruction in the path of the moving leaf is detected. Mounting them on the operator or panel does not cover the hazard zone.
Question 40Site Survey, Planning, and Layout
A survey shows the proposed control panel location is 40 m from the gate. What planning consideration does this distance introduce?
- The operator requires no earthing
- Photocells become unnecessary
- The gate will automatically open faster
- Voltage drop and cable sizing must be checked for the motor and accessory circuits Correct answer.
Explanation
Long cable runs introduce voltage drop, so the planner must verify conductor sizing for the motor supply and accessory circuits. Distance does not change gate speed, remove safety devices, or remove earthing needs.
Question 41Site Survey, Planning, and Layout
When surveying for underground cable routes, which existing utility is most important to locate before trenching?
- Decorative garden lighting above ground
- Buried electrical and communication services Correct answer.
- The driveway gate hinge
- The mailbox post
Explanation
Buried electrical and communication services pose strike hazards and legal constraints, so they must be located and marked before trenching. Above-ground items and gate hardware are not buried utilities.
Question 42Site Survey, Planning, and Layout
A site plan shows a driveway that narrows from 5 m at the street to 3.5 m at the gate line. Which dimension governs gate leaf sizing?
- The 5 m width at the street
- The average of the two widths
- The wider of the two widths
- The 3.5 m width at the gate line Correct answer.
Explanation
Gate leaves are sized to the opening where the gate is installed, so the narrower gate-line dimension governs. Street width and averages do not describe the actual opening.
Question 43Site Survey, Planning, and Layout
A client wants the gate to open inward toward a parked car that sits 1 m behind the gate line. What should the surveyor recommend?
- Proceed because the operator will stop automatically
- Reduce the gate speed to compensate
- Install the gate with no safety devices
- Relocate the parking area or change the gate to open outward Correct answer.
Explanation
A swing leaf needs its full arc clear, and a car parked 1 m behind the line obstructs that arc. The layout should be changed, either by moving the parking or reversing the opening direction. Relying on the operator or slowing the gate does not remove the obstruction.
Question 44Site Survey, Planning, and Layout
A survey reveals the ground at the gate line slopes sideways across the opening. What layout issue does this create for a sliding gate?
- The gate will slide faster on the slope
- The operator can be omitted
- The gate will not need a bottom guide
- The gate track must be level, so levelling or a different track arrangement is needed Correct answer.
Explanation
Sliding gate tracks must be level along their run, so cross-slope at the opening requires levelling or a track design that accommodates it. Slope does not remove the need for an operator or a bottom guide.
Question 45Site Survey, Planning, and Layout
A technician is planning a site with two separate vehicle entrances 30 m apart that share one control panel. What is the main layout challenge?
- Selecting the driveway paving material
- Choosing the gate color for each entrance
- Deciding which entrance opens first
- Routing control and safety circuits to both entrances while managing voltage drop Correct answer.
Explanation
Sharing a panel across two distant entrances requires careful cable routing for control and safety devices and checking voltage drop over the combined runs. Color, paving, and opening order are not the primary layout constraints.
Question 46Site Survey, Planning, and Layout
A survey shows the only practical control panel location is inside a garage with no ventilation and high summer temperatures. What planning consideration applies?
- The gate must be converted to manual only
- The panel can be sealed because heat does not affect electronics
- The photocells must be removed
- The panel's rated ambient temperature must be checked and ventilation provided Correct answer.
Explanation
Control panels have rated ambient temperature limits, so an enclosed hot space requires checking the rating and providing ventilation or relocation. Heat affects electronics, and safety devices are unrelated to panel siting.
Question 47Site Survey, Planning, and Layout
A site has a 5 m opening and the client wants a single sliding leaf. The fence line parallel to the opening provides only 4.2 m of clear travel before a wall. What is the best planning recommendation?
- Use a bi-folding or double sliding arrangement to fit the available travel Correct answer.
- Install a swing gate with no clearance check
- Reduce the opening to 4.2 m without consulting the client
- Install the single 5 m leaf anyway
Explanation
A single sliding leaf needs clear travel at least equal to the opening width, so 5 m of opening cannot be served by 4.2 m of travel. A bi-folding or double sliding design reduces the travel needed per leaf. Installing the leaf anyway or arbitrarily narrowing the opening is not acceptable.
Question 48Site Survey, Planning, and Layout
During a survey, the technician notes that the proposed gate line sits on a boundary disputed with a neighbor. What is the appropriate action?
- Proceed with installation to establish the position
- Move the gate 5 m onto the neighbor's land
- Pause the layout and refer the boundary question to the client before finalizing positions Correct answer.
- Ignore the dispute because gates are removable
Explanation
Boundary disputes are legal matters that must be resolved by the client before the layout is fixed, because gate position and fixings may affect the disputed line. Proceeding or encroaching creates legal and practical risk.
Question 49Site Survey, Planning, and Layout
A site plan shows a steep driveway with a cross-fall where a swing gate is proposed. Which combination of survey findings most affects operator selection?
- Number of pedestrians and gate brand
- Driveway paving pattern and streetlight count
- Leaf weight, gradient, and wind exposure at the opening Correct answer.
- Gate color and mailbox position
Explanation
Operator sizing depends on the load the leaf presents, which is driven by leaf weight, gradient, and wind exposure at the opening. Finish choices, paving patterns, and brand do not determine the required duty.
Question 50Site Survey, Planning, and Layout
A surveyor is laying out safety edges for a sliding gate. Which placement best protects users during closing?
- On the fixed fence post only
- On the control panel door
- On the driveway surface 10 m away
- Along the leading edge of the moving leaf Correct answer.
Explanation
Safety edges are fitted to the leading edge of the moving leaf so contact during closing is detected immediately. Fixed posts, panel doors, and distant surface points do not travel with the leaf.