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NFPA D/O Apparatus study materials
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NFPA D/O Apparatus practice questions

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Question 1Apparatus Inspection, Maintenance, and Documentation

Which NFPA standard establishes requirements for the inspection, maintenance, testing, and retirement of in-service fire apparatus?

  1. NFPA 1901
  2. NFPA 1002
  3. NFPA 1911 Correct answer.
  4. NFPA 1971

Explanation

NFPA 1911 is the document that governs inspection, maintenance, testing, and retirement of in-service automotive fire apparatus. NFPA 1901 addresses new apparatus construction, and NFPA 1002 addresses driver/operator qualifications.

Question 2Apparatus Inspection, Maintenance, and Documentation

Who is normally responsible for performing the routine pre-trip inspection of an apparatus before it responds?

  1. The apparatus manufacturer's field representative
  2. The officer in charge of the shift
  3. The driver/operator assigned to the apparatus Correct answer.
  4. The department's contracted fleet maintenance provider

Explanation

NFPA 1002 assigns routine tests, inspections, and servicing functions to the driver/operator, who verifies that the apparatus is operationally ready before each use. Outside providers and officers have other roles in the maintenance program.

Question 3Apparatus Inspection, Maintenance, and Documentation

Where should the results of a routine apparatus inspection be recorded?

  1. On the apparatus check sheet Correct answer.
  2. On the station whiteboard
  3. In the shift calendar
  4. In the training records file

Explanation

Inspection results belong in a written, retained record such as the department's apparatus check sheet or log so that deficiencies and their correction can be tracked. Informal notes that are erased or discarded do not satisfy the documentation requirement.

Question 4Apparatus Inspection, Maintenance, and Documentation

What is the minimum tire tread depth permitted on the front steering axle of a fire apparatus?

  1. 4/32 inch Correct answer.
  2. 8/32 inch
  3. 2/32 inch
  4. 6/32 inch

Explanation

Federal and department standards require at least 4/32 inch of tread on steering axle tires because those tires provide directional control. Non-steering tires may be run to a lesser minimum of 2/32 inch.

Question 5Apparatus Inspection, Maintenance, and Documentation

How should the engine coolant level be checked?

  1. By removing the radiator cap while the engine is at normal operating temperature
  2. By measuring the coolant that drains from the petcock
  3. At the surge tank with the engine cool Correct answer.
  4. By checking the color of the coolant in the overflow hose

Explanation

Coolant is checked at the surge or overflow tank with the engine cool. Removing a radiator cap from a hot, pressurized system can release scalding coolant and steam.

Question 6Apparatus Inspection, Maintenance, and Documentation

Tire pressure on fire apparatus should be checked:

  1. By kicking the sidewall of each tire
  2. After a long highway run at operating temperature
  3. By visual inspection only
  4. With a calibrated gauge when the tires are cold Correct answer.

Explanation

Pressure is set and verified with a calibrated gauge on cold tires, which is the condition used for the manufacturer's inflation specification. Hot tires read higher and will be underinflated if set to the cold specification.

Question 7Apparatus Inspection, Maintenance, and Documentation

Which group of items is checked during a walk-around inspection?

  1. Pump flow rates, nozzle pressures, and hose friction loss
  2. Aerial ladder load ratings, cable tension, and rotation limits
  3. Tire condition, lights, fluid leaks, and body damage Correct answer.
  4. Alternator output, battery specific gravity, and starter draw

Explanation

The walk-around is a visual and operational check of the apparatus exterior: tires and wheels, lamps and warning devices, leaks under the vehicle, body and compartment damage, and security of equipment. Performance testing of pumps and aerials is handled separately by qualified personnel.

Question 8Apparatus Inspection, Maintenance, and Documentation

When an inspection reveals a deficiency that the driver/operator cannot correct, the operator should:

  1. Repair it without notifying anyone
  2. Ignore the deficiency until the next scheduled service
  3. Report it to the officer in charge and record it Correct answer.
  4. Delay reporting it until the next shift

Explanation

Uncorrected deficiencies must be documented and reported to the officer in charge so that a decision can be made about repair and about keeping the apparatus in service. Failure to report allows an unsafe condition to persist and removes it from the maintenance record.

Question 9Apparatus Inspection, Maintenance, and Documentation

When checking the engine oil level, the driver/operator should:

  1. Check it while the engine is idling in gear
  2. Rely on the dashboard oil pressure gauge
  3. Check it immediately after shutdown with the engine hot
  4. With the apparatus level and the engine off Correct answer.

Explanation

The dipstick reading is accurate only when the apparatus is on level ground with the engine shut down and the oil allowed to drain back to the pan. Oil pressure indicates that the pump is working, not how much oil is in the crankcase.

Question 10Apparatus Inspection, Maintenance, and Documentation

The low-air-pressure warning device on an air-brake equipped apparatus must activate before system pressure falls below:

  1. 45 psi
  2. 60 psi Correct answer.
  3. 100 psi
  4. 80 psi

Explanation

The warning must come on before pressure drops below 60 psi so the operator has time to stop safely while the service brakes still function. Spring brakes begin applying on their own at a much lower pressure.

Question 11Apparatus Inspection, Maintenance, and Documentation

How often must a fire department apparatus be inspected?

  1. Quarterly, as required by NFPA 1901
  2. At intervals established by the AHJ Correct answer.
  3. Annually, as required by NFPA 1911
  4. Whenever a defect is noticed by any member

Explanation

The authority having jurisdiction sets the inspection interval through department policy, and the driver/operator performs the checks required by that policy, including a pre-trip check before each use. NFPA documents describe what must be covered, not a single fixed frequency for routine inspections.

Question 12Apparatus Inspection, Maintenance, and Documentation

A defect is found that makes an apparatus unsafe to operate. The driver/operator should:

  1. Reduce the apparatus speed by half
  2. Operate it only for emergency responses
  3. Place it out of service until repaired Correct answer.
  4. Move it to reserve status without documentation

Explanation

An apparatus with a defect affecting safe operation is placed out of service, tagged or otherwise identified, and reported so that repairs can be completed before it returns to service. Emergency use of a known unsafe apparatus is not permitted.

Question 13Apparatus Inspection, Maintenance, and Documentation

Which condition of a drive belt requires replacement?

  1. Cold ambient temperature at start-up in winter
  2. Glazing, cracking, or frayed edges Correct answer.
  3. Normal deflection at the midpoint
  4. A light dust film on the pulley

Explanation

Belts showing glazing, cracks, fraying, or missing chunks have lost their ability to transmit load and should be replaced. Proper deflection and normal pulley dust are not defects.

Question 14Apparatus Inspection, Maintenance, and Documentation

When inspecting batteries, the driver/operator should check for:

  1. Specific gravity of the fuel
  2. Wheel bearing grease level
  3. Hydraulic fluid in the cells
  4. Corroded terminals and a loose hold-down Correct answer.

Explanation

Battery inspection looks for corroded or loose cable connections, a secure hold-down, cracks, and electrolyte level where applicable. A loose battery can short against surrounding metal or lose connection during operation.

Question 15Apparatus Inspection, Maintenance, and Documentation

Before engaging the pump on a stationary apparatus, the driver/operator should ensure:

  1. The engine throttle is set to full governed rpm
  2. The tank-to-pump valve is fully closed and locked
  3. The parking brake is set and wheels chocked Correct answer.
  4. The apparatus is rolling slowly forward

Explanation

The apparatus must be held stationary with the parking brake applied and wheels chocked before the pump is engaged, so the driveline cannot move the vehicle. The tank-to-pump valve is opened and engine speed is brought up only after the pump is engaged.

Question 16Apparatus Inspection, Maintenance, and Documentation

A complete apparatus inspection record should include which of the following?

  1. The apparatus purchase price and warranty date
  2. Only the deficiencies that were repaired
  3. Only the signature of the fleet maintenance manager
  4. Date, mileage, inspector, and deficiencies noted Correct answer.

Explanation

A usable inspection record identifies when the check was made, the apparatus mileage or hour reading, who performed it, and what was found, including items corrected and items outstanding. This allows trends and repeat defects to be tracked.

Question 17Apparatus Inspection, Maintenance, and Documentation

After returning from an incident, the driver/operator should:

  1. Leave the apparatus as found for the next crew
  2. Refuel, clean, restock, and report deficiencies Correct answer.
  3. Defer all servicing until the monthly inspection
  4. Perform only a visual check from the cab

Explanation

Post-incident servicing restores the apparatus to a ready state: fuel, fluids, cleaning, equipment restocking, and reporting any damage or deficiency found. Deferring these tasks leaves the next crew with an apparatus that may not be ready to respond.

Question 18Apparatus Inspection, Maintenance, and Documentation

A warning light remains illuminated after the engine starts. The driver/operator should:

  1. Increase engine speed until the light goes out
  2. Continue responding and monitor the gauge
  3. Cover the light and continue normal operations
  4. Investigate the cause and report it Correct answer.

Explanation

A warning lamp that stays on after start-up signals a fault that must be identified before the apparatus is used. The operator checks the affected system, shuts down if the condition warrants, and reports the fault for repair.

Question 19Apparatus Inspection, Maintenance, and Documentation

Preventive maintenance on fire apparatus is best described as:

  1. Testing the pump only after a major overhaul
  2. Rebuilding the apparatus at the end of its service life
  3. Scheduled servicing to prevent breakdowns Correct answer.
  4. Repairing components after they fail in service

Explanation

Preventive maintenance consists of scheduled inspection, lubrication, adjustment, and replacement performed before failure occurs. It reduces unscheduled downtime and keeps the apparatus reliable during emergencies.

Question 20Apparatus Inspection, Maintenance, and Documentation

The driver/operator finds the fuel level below one quarter tank at the start of a shift. The appropriate action is to:

  1. Restrict the apparatus to nonemergency responses
  2. Refuel before the apparatus is placed in service Correct answer.
  3. Wait for the next scheduled fueling day
  4. Record the level and take no other action

Explanation

Apparatus should be kept fueled and ready so that an extended pumping operation or response is not limited by a low tank. Low fuel can also cause pickup problems and stalls, particularly on grades or during pump operations.

Question 21Apparatus Inspection, Maintenance, and Documentation

With the engine at fast idle, the air compressor on a typical fire apparatus should build system pressure from 85 psi to 100 psi within:

  1. 60 seconds
  2. 15 seconds
  3. 30 seconds
  4. 45 seconds Correct answer.

Explanation

The compressor build-up check requires 85 to 100 psi within 45 seconds at fast idle. A longer build-up time points to a worn compressor, a slipping belt, or leaks in the system.

Question 22Apparatus Inspection, Maintenance, and Documentation

During a static air-brake leak test on a single-unit apparatus with the engine off and the system fully charged, air loss with the brakes applied should not exceed:

  1. 3 psi in five minutes
  2. 10 psi in one minute
  3. 3 psi in one minute Correct answer.
  4. 15 psi in two minutes

Explanation

With the system charged and the engine off, leakage with the brakes applied is limited to 3 psi per minute for a single unit, with a slightly higher allowance for a combination vehicle. Greater loss indicates a leak that must be located and repaired.

Question 23Apparatus Inspection, Maintenance, and Documentation

The spring (emergency) brakes on an air-brake equipped apparatus normally begin to apply when system pressure falls to approximately:

  1. 60 to 75 psi
  2. 100 to 120 psi
  3. 80 to 95 psi
  4. 20 to 45 psi Correct answer.

Explanation

Spring brakes are held off by air pressure and begin to apply mechanically in the 20 to 45 psi range as pressure is lost. This is why the low-pressure warning activates much earlier, before the vehicle brakes itself.

Question 24Apparatus Inspection, Maintenance, and Documentation

During the walk-around inspection, rust streaks radiating from the lug nuts on a wheel indicate:

  1. Loose or improperly torqued lug nuts Correct answer.
  2. Excess tire sealant applied at the wheel
  3. Correctly seated wheel bearings
  4. Normal heat cycling of the brake drum

Explanation

Rust streaking or shiny wear tracking around lug nuts shows that the nuts have moved against the wheel, which points to looseness. The wheel must be checked and torqued before the apparatus is operated.

Question 25Apparatus Inspection, Maintenance, and Documentation

A tire on the apparatus has a bulge in the sidewall with fabric cord visible. The driver/operator should:

  1. Reduce the tire pressure and continue in service
  2. Use the apparatus only for short responses
  3. Remove the apparatus from service until replaced Correct answer.
  4. Mark the tire and recheck it at the next monthly inspection

Explanation

A sidewall bulge with exposed cord means the tire structure has failed and a blowout is likely. The apparatus stays out of service until the tire is replaced, and the condition is documented.

Question 26Apparatus Inspection, Maintenance, and Documentation

The engine coolant level of an apparatus with a surge tank should be checked:

  1. with the engine running at fast idle and the heater on
  2. only after the radiator cap has been removed
  3. with the engine cool and the apparatus on level ground Correct answer.
  4. immediately after a highway road test while the system is still pressurized

Explanation

Coolant expands as it heats, and a level read with the engine hot and the system pressurized can be misleading. The reliable method is to check the surge tank or reservoir with the engine cool and the apparatus parked on level ground, then compare the level to the marked range. Opening a radiator cap on a hot, pressurized system can cause severe scalding burns and is not part of a routine level check.

Question 27Apparatus Inspection, Maintenance, and Documentation

Inspection and maintenance records for fire apparatus are maintained primarily to:

  1. take the place of the annual performance test required for in-service fire apparatus
  2. demonstrate that scheduled preventive maintenance intervals can be safely extended
  3. satisfy the department's insurance carrier so that the annual premium stays low
  4. document condition history to support repair and safety decisions Correct answer.

Explanation

Records create a documented history of inspections, repairs, and defects that shows how the apparatus has been maintained over time. That history supports warranty claims, reveals recurring problems that need a deeper repair, and demonstrates due diligence if the apparatus is involved in an incident. Records complement required inspections and tests; they never substitute for them.

Question 28Apparatus Inspection, Maintenance, and Documentation

When checking the automatic transmission fluid with a dipstick, the driver/operator should check it:

  1. at normal operating temperature, engine idling, in neutral, parking brake set Correct answer.
  2. only when the fluid is cold, because hot fluid expands and gives a false reading
  3. with the engine shut down and the fluid still hot from a long road run
  4. with the transmission in drive and a second person holding the service brake

Explanation

Transmission fluid is measured with the fluid at normal operating temperature, the engine idling, the transmission in neutral or park, the parking brake set, and the apparatus level. Under these conditions the dipstick reading reflects the true operating level. A cold check is only a rough approximation and should be confirmed against the manufacturer's procedure.

Question 29Apparatus Inspection, Maintenance, and Documentation

After an out-of-service apparatus has been repaired, the driver/operator should confirm that:

  1. only the shop that performed the repair may place it back in service
  2. the apparatus has been washed and the fuel tank filled before any testing
  3. the repair shop has invoiced the department before the apparatus is used again
  4. the repair is recorded and the system passes a function check Correct answer.

Explanation

An apparatus returns to service only when the repair has been documented and the affected system has been checked to confirm it operates correctly. The record should identify what was repaired and when, so the condition history stays complete. Cleaning, fueling, or billing status does not establish that the apparatus is mechanically sound.

Question 30Apparatus Inspection, Maintenance, and Documentation

The engine oil on the dipstick of an apparatus appears milky and light brown. The driver/operator should:

  1. record the color as a normal condition and recheck it at the following weekly inspection
  2. place the apparatus out of service and report possible coolant leakage Correct answer.
  3. top off the crankcase with fresh oil and note the color on the inspection form
  4. add an oil thickener and continue to operate the apparatus until the next scheduled oil change

Explanation

Milky or light-brown oil indicates that water or coolant has emulsified with the lubricant, typically from an internal leak such as a failed head gasket or oil cooler. Diluted oil loses film strength and can destroy bearings and other internal parts in a short time. The apparatus should be taken out of service and the condition reported so the source of the leak is found and repaired.

Question 31Safe Driving and Operating Procedures

While backing a fire apparatus, the driver/operator loses sight of the spotter in the mirrors. What is the correct action?

  1. Ask the spotter to move to the opposite side.
  2. Continue backing using the rear-view camera alone.
  3. Stop the apparatus until the spotter is visible again. Correct answer.
  4. Continue backing slowly while sounding the horn.

Explanation

A spotter must remain in the driver's view at all times while the apparatus is backing. If visual contact is lost, the driver must stop immediately until the spotter is seen again.

Question 32Safe Driving and Operating Procedures

When must occupants of a fire apparatus wear seat belts?

  1. Whenever the apparatus is in motion. Correct answer.
  2. Only while traveling on public roads.
  3. Only when seated in the front cab.
  4. Only during emergency responses.

Explanation

Safety standards require all occupants to be seated and restrained any time the apparatus is moving. This applies to non-emergency travel and to personnel riding in any seating position.

Question 33Safe Driving and Operating Procedures

Under ideal road and weather conditions, what minimum following distance should a fire apparatus maintain?

  1. One second
  2. Eight seconds
  3. Four seconds Correct answer.
  4. Two seconds

Explanation

A following distance of at least four seconds is the accepted minimum for apparatus under ideal conditions. The gap should be increased when roads are wet, visibility is poor, or the apparatus is heavily loaded.

Question 34Safe Driving and Operating Procedures

Approaching a red traffic signal during an emergency response, the driver should:

  1. Proceed through after briefly sounding the siren.
  2. Move into the opposing lane to bypass stopped traffic.
  3. Slow down and proceed if no vehicles are visible.
  4. Stop completely, then proceed when all lanes are clear. Correct answer.

Explanation

Emergency warning devices do not grant an absolute right-of-way. The driver must stop at a red signal and confirm that all lanes of traffic, including cross traffic, have yielded before proceeding.

Question 35Safe Driving and Operating Procedures

The rear of the apparatus begins to skid to the right. How should the driver respond?

  1. Steer left, away from the skid.
  2. Accelerate to pull the apparatus out of the skid.
  3. Steer right, toward the direction of the skid. Correct answer.
  4. Apply hard braking and hold the wheel straight.

Explanation

In a rear-wheel skid, the driver should steer in the direction the rear is sliding so the front of the apparatus follows the intended path. Hard braking or acceleration can worsen the loss of traction.

Question 36Safe Driving and Operating Procedures

How should the brakes be applied during a panic stop in an apparatus equipped with ABS?

  1. Pump the brake pedal rapidly to prevent wheel lock.
  2. Press the pedal firmly and hold it while steering. Correct answer.
  3. Use the parking brake together with the foot brake.
  4. Apply light, steady pressure to avoid activating the system.

Explanation

With ABS, the driver should apply firm, continuous brake pressure and concentrate on steering. The system automatically modulates pressure to prevent wheel lockup, so pumping the pedal defeats its purpose.

Question 37Safe Driving and Operating Procedures

On an air-brake equipped apparatus, the low-air-pressure warning must activate before pressure drops below:

  1. 70 psi (480 kPa)
  2. 60 psi (415 kPa) Correct answer.
  3. 80 psi (550 kPa)
  4. 30 psi (205 kPa)

Explanation

Federal braking standards require a visible or audible low-air warning before system pressure falls below 60 psi. As pressure continues to drop, the spring brakes apply automatically to stop the apparatus.

Question 38Safe Driving and Operating Procedures

When parking apparatus on a downhill grade, the driver should:

  1. Rely on the spring brakes to hold the apparatus.
  2. Chock the wheels and turn the front wheels toward the curb. Correct answer.
  3. Leave the transmission in neutral and rely on the parking brake.
  4. Leave the front wheels straight ahead.

Explanation

On a downgrade, the parking brake should be set, the wheels chocked, and the front wheels turned toward the curb so the apparatus would roll away from traffic if it moved. The transmission should be left in a low gear or park.

Question 39Safe Driving and Operating Procedures

What is the correct procedure for crossing railroad tracks?

  1. Cross only when the crossing gates are lowered.
  2. Cross quickly without stopping to reduce exposure time.
  3. Stop on the tracks to check for trains in both directions.
  4. Stop, look, and listen, then cross the tracks. Correct answer.

Explanation

The apparatus should be brought to a stop, a window opened, and the driver should look and listen before crossing. The apparatus should never stop on the tracks and should cross without shifting gears.

Question 40Safe Driving and Operating Procedures

Why should a driver reduce speed before entering a curve rather than braking while in the curve?

  1. Braking in a curve shifts weight and can cause a rollover. Correct answer.
  2. Curves are banked so that braking is unnecessary.
  3. Tires grip better at higher speeds in a curve.
  4. Braking in a curve improves tire traction on the outside wheels.

Explanation

Braking transfers weight forward and combines braking and cornering forces on the tires. On a heavy apparatus with a high center of gravity, this combination can cause a loss of control or a rollover.

Question 41Safe Driving and Operating Procedures

Which condition most increases the likelihood of hydroplaning?

  1. Reduced vehicle speed
  2. New tires with deep tread
  3. Standing water combined with underinflated tires Correct answer.
  4. Dry pavement with high traction

Explanation

Hydroplaning occurs when a layer of water lifts the tires off the pavement. Standing water, low tire pressure, and worn tread all increase the risk, and the risk rises with speed.

Question 42Safe Driving and Operating Procedures

What is the recommended technique for descending a long, steep grade?

  1. Use the highest gear and brake hard at each curve.
  2. Ride the brakes lightly with steady pressure during the entire descent.
  3. Select a lower gear before descending and use engine braking. Correct answer.
  4. Shift to neutral and coast down the grade.

Explanation

Selecting a lower gear before the descent uses engine braking to control speed and reduces reliance on the wheel brakes. Brakes should be applied intermittently rather than continuously to avoid overheating and fade.

Question 43Safe Driving and Operating Procedures

A front tire blows out at highway speed. What should the driver do first?

  1. Hold the wheel firmly and ease off the accelerator. Correct answer.
  2. Accelerate to stabilize the apparatus.
  3. Turn off the engine to stop the apparatus.
  4. Brake hard and steer quickly to the shoulder.

Explanation

The driver should grip the wheel firmly, keep the apparatus traveling straight, and allow speed to decrease gradually before moving off the road. Hard braking or abrupt steering can cause a loss of control.

Question 44Safe Driving and Operating Procedures

What should the driver do before backing any apparatus?

  1. Have a passenger watch from the cab.
  2. Turn on all emergency warning lights.
  3. Walk around the apparatus to check for obstructions. Correct answer.
  4. Sound the air horn continuously.

Explanation

Before backing, the driver should walk around the apparatus to identify people, vehicles, and obstacles in the path. A spotter should then be positioned where the driver can see them in the mirrors.

Question 45Safe Driving and Operating Procedures

What do warning lights and sirens provide to an emergency apparatus driver?

  1. Absolute right-of-way over all other traffic at all times.
  2. A request for others to yield, not a guarantee. Correct answer.
  3. Exemption from all traffic laws.
  4. Protection from civil liability.

Explanation

Lights and sirens ask other road users to yield, but they do not compel them to do so. The driver must still proceed with due regard for the safety of others and be prepared for vehicles that do not respond.

Question 46Safe Driving and Operating Procedures

When should an engine brake or retarder be switched off?

  1. While descending a dry mountain grade at speed.
  2. While towing a trailer on dry pavement.
  3. On wet, icy, or otherwise slippery roads. Correct answer.
  4. While driving at highway speed.

Explanation

A retarder applies braking force at the drive wheels, which can break traction on a slippery surface. It should be turned off or reduced when the road is wet, icy, or otherwise slippery.

Question 47Safe Driving and Operating Procedures

If a collision is unavoidable, what should the driver try to do?

  1. Release the steering wheel and brace for impact.
  2. Steer into oncoming traffic to avoid a fixed object.
  3. Steer for a glancing blow on the least hazardous object. Correct answer.
  4. Accelerate to minimize time in the intersection.

Explanation

When a crash cannot be avoided, the driver should choose the least harmful path and try to strike at an angle so the apparatus is deflected rather than stopped abruptly. Maintaining control of the steering is essential.

Question 48Safe Driving and Operating Procedures

Before driving beneath an overhead structure, the driver must know:

  1. The weight of the water carried.
  2. The number of personnel on board.
  3. The posted speed limit for trucks.
  4. Apparatus height and posted clearance. Correct answer.

Explanation

The driver must compare the apparatus's overall height, including any mounted equipment, with the clearance posted on the structure. If clearance is insufficient or unknown, an alternate route should be used.

Question 49Safe Driving and Operating Procedures

During the walk-around inspection, which items should the driver check?

  1. Only the fuel level and odometer.
  2. Tires, lights, fluids, and air pressure. Correct answer.
  3. Only the pump panel gauges.
  4. Only the warning lights and siren.

Explanation

The walk-around inspection covers items that affect safe operation, including tire condition, lighting, fluid levels, and air pressure. Defects found during the inspection must be corrected or reported before the apparatus is placed in service.

Question 50Safe Driving and Operating Procedures

When stopping behind another vehicle, the driver should leave enough space to:

  1. See the top of the other vehicle's roof.
  2. Sound the horn without being blocked.
  3. Allow passengers to exit through the front doors.
  4. See the rear tires of the vehicle ahead on the pavement. Correct answer.

Explanation

Leaving enough space to see the rear tires of the vehicle ahead ensures room to maneuver around it if necessary. This also provides a cushion if the apparatus is struck from behind.