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NT Driver Knowledge Test study materials
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NT Driver Knowledge Test practice questions

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Question 1Road rules and traffic signs

What does a red octagonal sign always mean?

  1. End of all restrictions
  2. Come to a complete stop Correct answer.
  3. Reduce speed only if traffic is present
  4. Give way to traffic already on the road

Explanation

An octagon is used only for stop signs, so the shape alone identifies the instruction. A driver must bring the vehicle to a full stop at the stop line or before entering the intersection, then proceed only when it is safe.

Question 2Road rules and traffic signs

A steady circular red traffic light is showing. What must you do?

  1. Sound your horn and proceed carefully
  2. Slow down and continue if no traffic is coming
  3. Stop only if a pedestrian is waiting
  4. Stop and remain stopped until the light changes Correct answer.

Explanation

A steady red circle means all vehicles must stop at the stop line and stay stopped until a green signal appears. Proceeding on red is only permitted where a specific rule or sign allows it, such as some slip lanes.

Question 3Road rules and traffic signs

You are approaching a pedestrian crossing where a person is waiting to cross. What is required?

  1. Flash your headlights and keep moving
  2. Accelerate to pass before they step out
  3. Proceed if you are under the speed limit
  4. Give way to the pedestrian at the crossing Correct answer.

Explanation

Drivers must give way to pedestrians at marked crossings, and approaching vehicles should slow so they can stop safely. Failing to give way at a pedestrian crossing is a serious offence with heavy penalties.

Question 4Road rules and traffic signs

What is the default speed limit on a built-up street in a residential area unless signs show otherwise?

  1. 40 km/h
  2. 50 km/h Correct answer.
  3. 80 km/h
  4. 60 km/h

Explanation

In built-up areas the default speed limit is 50 km/h where no sign indicates a different limit. Drivers must still reduce speed below that figure when conditions such as rain, poor visibility or heavy pedestrian activity require it.

Question 5Road rules and traffic signs

What does a broken white line painted along the centre of a two-way road indicate?

  1. Overtaking is prohibited at all times
  2. You must drive with hazard lights on
  3. The lane is reserved for buses
  4. You may cross it to overtake when it is safe Correct answer.

Explanation

A broken centre line permits crossing to overtake or turn when visibility and traffic conditions make it safe. It is a permissive marking rather than a prohibition, but the driver still bears responsibility for judging safety.

Question 6Road rules and traffic signs

When are you permitted to sound your vehicle's horn?

  1. To hurry a pedestrian off a crossing
  2. To warn other road users of your approach or of danger Correct answer.
  3. To greet a friend on the footpath
  4. To express annoyance at a slow driver

Explanation

The horn is a warning device, used to alert others to your presence or to an imminent hazard. Using it for social greetings or to express frustration is misuse and can attract a fine.

Question 7Road rules and traffic signs

What must you do before changing lanes on a multi-lane road?

  1. Signal only after you have begun moving across
  2. Increase speed sharply and move across
  3. Rely on the vehicle behind to make room
  4. Check mirrors, signal, and check your blind spot Correct answer.

Explanation

A safe lane change requires checking mirrors, indicating your intention in good time, and turning your head to check the blind spot. You must also give way to traffic already in the lane you intend to enter.

Question 8Road rules and traffic signs

At an intersection with no signs or lights, two vehicles arrive at the same time from different roads. Who gives way?

  1. The vehicle travelling fastest
  2. The larger vehicle
  3. The vehicle that arrived second
  4. The vehicle on the left gives way to the vehicle on the right Correct answer.

Explanation

Where there are no signs, signals or lines controlling priority, the give-way-to-the-right rule applies. The vehicle on the left must yield so that a predictable outcome is reached.

Question 9Road rules and traffic signs

A school zone sign shows 40 km/h during stated times. What does this mean?

  1. The 40 km/h limit applies during the times shown on the sign Correct answer.
  2. The limit applies only to school buses
  3. The limit applies only when children are visible
  4. The sign is advisory and the normal limit continues

Explanation

School zone limits operate during the times displayed on the sign, and drivers must obey the lower limit regardless of whether children happen to be in sight. Outside those times the normal road limit resumes.

Question 10Road rules and traffic signs

You are driving and an emergency vehicle approaches from behind with flashing lights and a siren. What should you do?

  1. Stop immediately where you are
  2. Continue at the same speed in the same lane
  3. Move as far left as practicable and stop if necessary to let it pass Correct answer.
  4. Speed up to stay ahead of it

Explanation

Drivers must clear a path for an emergency vehicle using lights and siren, moving left and stopping if that is the only way to let it through. Blocking or racing an emergency vehicle is an offence.

Question 11Road rules and traffic signs

What does a yellow diamond-shaped sign with a black symbol generally indicate?

  1. A warning of a hazard or road feature ahead Correct answer.
  2. A regulatory prohibition
  3. A tourist information point
  4. A parking restriction

Explanation

Diamond-shaped signs are warning signs, alerting drivers to hazards such as curves, intersections or changing road conditions ahead. The symbol inside identifies the specific hazard so the driver can adjust speed and position.

Question 12Road rules and traffic signs

A vehicle ahead of you is a bus signalling to leave a bus stop. What is expected of you?

  1. Stop completely until the bus departs
  2. Give way to the bus when it is safe to do so Correct answer.
  3. Accelerate to pass before it moves
  4. Sound your horn to warn the bus

Explanation

In areas where the rule applies, drivers must give way to a bus indicating its intention to re-enter traffic from a bus stop. The courtesy should be extended only when it is safe, so check mirrors before slowing.

Question 13Road rules and traffic signs

You intend to turn left at an intersection and a pedestrian is crossing the road you are turning into. What must you do?

  1. Drive around the pedestrian on the wrong side
  2. Turn behind the pedestrian without stopping
  3. Sound your horn so the pedestrian hurries
  4. Wait until the pedestrian has cleared your path before turning Correct answer.

Explanation

A turning vehicle must give way to pedestrians crossing the road it is entering. The turn should be completed only once the pedestrian is clear of your intended path.

Question 14Road rules and traffic signs

What does a sign showing a red circle with a red diagonal slash through a symbol mean?

  1. The sign marks the start of a school zone
  2. The sign applies only to heavy vehicles
  3. The activity or vehicle shown is prohibited Correct answer.
  4. The activity is permitted only at night

Explanation

A red circle with a diagonal slash is the standard prohibition format, meaning the action or vehicle depicted is not allowed. Drivers must comply from the point where the sign is placed.

Question 15Road rules and traffic signs

You are driving at night and an oncoming vehicle has high beam headlights on. What is the safest response?

  1. Look toward the left edge of your lane and slow down Correct answer.
  2. Flash your high beams back repeatedly
  3. Close your eyes briefly until the vehicle passes
  4. Turn on your interior light

Explanation

When dazzled, drivers should avoid staring at the oncoming lights and instead use the left edge of the lane as a guide while reducing speed. This maintains lane position until the vehicle passes and vision recovers.

Question 16Road rules and traffic signs

A continuous double centre line separates your lane from oncoming traffic. What does it mean?

  1. Neither direction may cross the lines to overtake Correct answer.
  2. You may cross to overtake if the road ahead is clear
  3. You may cross to turn into a driveway at any point
  4. Only heavy vehicles may cross

Explanation

Double continuous lines prohibit crossing from either direction for overtaking. A driver may cross only in limited circumstances such as entering or leaving adjacent land where it is safe and permitted.

Question 17Road rules and traffic signs

You are at a roundabout and intend to take the second exit. Which lane and signal practice is generally correct?

  1. Enter without signalling and signal left after passing the first exit
  2. Signal right on approach, then signal left after passing the exit before yours Correct answer.
  3. Use no signals at any stage
  4. Signal left on approach and stay in the right lane

Explanation

For a straight-through or second exit movement, drivers generally signal right on approach in multi-lane roundabouts and switch to a left signal after passing the exit preceding their own. Signalling out confirms your intention to leave and helps following traffic.

Question 18Road rules and traffic signs

What is the purpose of an edge line painted along the left side of a rural road?

  1. To mark the boundary of the sealed carriageway Correct answer.
  2. To indicate a bicycle lane only
  3. To show where overtaking is permitted
  4. To mark a loading zone

Explanation

Edge lines define the outer limit of the traffic lane and help drivers maintain position, particularly in poor light or wet weather. They are not a separate lane marking or an overtaking indicator.

Question 19Road rules and traffic signs

You are following a large truck that is about to turn left at an intersection. Why should you avoid passing on its left?

  1. The truck will accelerate faster than you expect
  2. Passing on the left is always illegal for cars
  3. The truck may swing wide and its driver has limited visibility on that side Correct answer.
  4. Trucks are required to use the left lane at all times

Explanation

Large vehicles often need to swing wide in the opposite direction before completing a turn, and the driver's blind spots are extensive. Passing on the inside of a turning truck risks being crushed against the kerb.

Question 20Road rules and traffic signs

A white diamond symbol is painted in your lane on the approach to a marked pedestrian crossing. What does it indicate?

  1. A crossing is ahead and you should prepare to stop Correct answer.
  2. The lane ends shortly
  3. Parking is permitted in that section
  4. You should increase speed to clear the crossing

Explanation

Diamond markings warn drivers that a pedestrian or children's crossing is approaching, giving time to check mirrors and slow. Drivers should be ready to stop for anyone waiting to cross.

Question 21Road rules and traffic signs

You are driving in heavy rain and the road surface is covered with water. Which action best reduces the risk of losing control?

  1. Turn on high beam headlights
  2. Reduce speed and increase the following distance Correct answer.
  3. Brake hard whenever you see water
  4. Maintain the posted speed limit exactly

Explanation

Wet roads reduce tyre grip and lengthen stopping distances, so slowing down and leaving a larger gap gives more time to react. Smooth steering and braking also help prevent skidding or aquaplaning.

Question 22Road rules and traffic signs

A traffic controller is directing vehicles at an intersection where the traffic lights are working. Whose direction must you follow?

  1. The road markings only
  2. The vehicle in front of you
  3. The traffic lights, because they override people
  4. The traffic controller, whose directions override the lights Correct answer.

Explanation

A police officer or authorised traffic controller takes priority over signals and signs, because they can see conditions the equipment cannot. Drivers must obey their hand signals and directions immediately.

Question 23Road rules and traffic signs

You are waiting to turn right at an intersection with a green circle but no green arrow. An oncoming vehicle is approaching. What must you do?

  1. Wait until the oncoming vehicle has passed and it is safe to turn Correct answer.
  2. Edge forward until the oncoming vehicle stops
  3. Reverse out of the intersection
  4. Turn immediately because you have a green light

Explanation

A green circle allows you to proceed but does not give priority over oncoming traffic when turning across its path. The turn must wait for a safe gap, and a driver should not enter the intersection unless able to clear it.

Question 24Road rules and traffic signs

A driver is overtaking you on a two-lane rural road and an oncoming vehicle appears. What is the safest action for you?

  1. Maintain your speed and move as far left as is safe to give room Correct answer.
  2. Sound your horn continuously and hold your position
  3. Brake sharply and stop in the lane
  4. Accelerate so the overtaking driver can tuck in behind

Explanation

When an overtaking manoeuvre becomes risky, the overtaken driver should hold a steady speed and keep left to create space, allowing the other driver to complete or abandon the pass. Sudden braking or accelerating can worsen the situation.

Question 25Road rules and traffic signs

You are approaching a railway level crossing with flashing red lights and no boom gates. What is required?

  1. Proceed only if the vehicle ahead crosses first
  2. Stop only if a train is visible
  3. Stop and remain stopped until the lights stop flashing Correct answer.
  4. Slow down and proceed if you cannot see a train

Explanation

Flashing red lights at a level crossing mean a train is approaching, and drivers must stop and stay stopped until the signals cease. Trains cannot stop quickly and may be hidden by curves or vegetation.

Question 26Road rules and traffic signs

What must you do when you see a stop sign at an intersection?

  1. Sound your horn and proceed through the intersection
  2. Come to a complete stop and give way to all traffic before proceeding Correct answer.
  3. Slow down and continue if the road looks clear
  4. Stop only if another vehicle is approaching

Explanation

A stop sign requires a full stop at the stop line or, if there is none, at the edge of the intersection. You must then give way to vehicles already in or entering the intersection before moving off. Slowing down without stopping is not sufficient, even when the road appears empty.

Question 27Road rules and traffic signs

A sign shows a red circle with the number 60 inside it. What does this sign mean?

  1. A speed advisory for wet weather only
  2. The minimum speed is 60 km/h
  3. The distance to the next town is 60 km
  4. The maximum speed limit is 60 km/h Correct answer.

Explanation

A red circle containing a number is a regulatory speed limit sign. It sets the maximum lawful speed for that stretch of road in kilometres per hour. The limit applies in normal conditions, and you may drive slower if conditions require it.

Question 28Road rules and traffic signs

What does a broken white line painted between two lanes travelling in the same direction indicate?

  1. The road narrows ahead in the left lane
  2. You may change lanes when it is safe to do so Correct answer.
  3. The lane on the right is for overtaking only
  4. Lane changing is prohibited at all times

Explanation

A broken white line separates lanes moving in the same direction and may be crossed. You may change lanes across it after checking mirrors and blind spots and signalling. The line does not grant priority, so you must still give way to traffic already in the lane you enter.

Question 29Road rules and traffic signs

You approach a pedestrian crossing where a person is waiting to cross. What must you do?

  1. Continue at the same speed because they have not stepped out
  2. Move to the centre of the road and pass them
  3. Flash your headlights so they wait for you
  4. Slow down and be ready to stop so the pedestrian can cross Correct answer.

Explanation

Drivers must give way to pedestrians at marked crossings, including those waiting to cross. You should slow down and stop if needed to let them cross safely. Failing to give way at a pedestrian crossing is a serious offence.

Question 30Road rules and traffic signs

What does a give way sign require you to do?

  1. Proceed first because you have reached the intersection
  2. Stop completely for at least three seconds
  3. Slow down or stop and give way to traffic on the road you are entering Correct answer.
  4. Give way only to vehicles approaching from the right

Explanation

A give way sign means you must slow down or stop as necessary and yield to traffic already on or approaching the road you intend to enter. Unlike a stop sign, a full stop is required only if needed to give way safely. You must not proceed until the way is clear.

Question 31Road rules and traffic signs

What is the meaning of a sign showing a black U-turn arrow crossed out by a red diagonal line?

  1. You must turn left at the next intersection
  2. U-turns are prohibited at this location Correct answer.
  3. A U-turn lane begins ahead
  4. U-turns are permitted only for cars

Explanation

A red diagonal slash across a symbol means the manoeuvre shown is not allowed. Here the U-turn arrow is crossed out, so making a U-turn at that point is prohibited. You must continue and find a lawful place to turn around.

Question 32Road rules and traffic signs

When may you drive in a lane marked with a bicycle symbol and a solid white line?

  1. You may not drive in it because it is reserved for cyclists Correct answer.
  2. You may drive in it whenever traffic is heavy
  3. You may park in it briefly to load goods
  4. You may use it to overtake slower vehicles

Explanation

A lane marked with a bicycle symbol and bounded by a solid line is a dedicated bicycle lane. Motor vehicles must keep out of it, including when traffic is congested. Entering it can endanger cyclists and is an offence.

Question 33Road rules and traffic signs

What should you do when a traffic light shows a flashing yellow circle?

  1. Stop and wait until the light turns green
  2. Accelerate to clear the intersection quickly
  3. Treat the intersection as closed and turn around
  4. Slow down and proceed with caution, giving way as required Correct answer.

Explanation

A flashing yellow signal means the lights are operating in caution mode, often outside normal hours. You should slow down, check carefully and apply the normal give-way rules at the intersection. It does not mean stop, but it also does not give you priority.

Question 34Road rules and traffic signs

You are driving in the left lane of a two-lane road and want to turn right at an intersection ahead. What should you do?

  1. Signal, check for traffic and move into the right lane well before the turn Correct answer.
  2. Turn right directly from the left lane if no cars are beside you
  3. Stop in the left lane and wait for a gap in the right lane
  4. Continue past the intersection and make the turn at the next street

Explanation

Right turns must be made from the lane closest to the centre line or right-hand edge. You should signal early, check mirrors and blind spots, and change lanes when it is safe. Turning across another lane without positioning correctly is dangerous and unlawful.

Question 35Road rules and traffic signs

You are approaching a crest on a narrow rural road and cannot see what is beyond it. What is the safest action?

  1. Sound your horn continuously until you pass the crest
  2. Maintain your speed because the road is signposted at the limit
  3. Reduce speed so you can stop within the distance you can see to be clear Correct answer.
  4. Move to the centre of the road to get a better view

Explanation

You must always be able to stop within the distance you can see ahead to be clear. On a crest or blind bend, that visible distance may be short, so slowing down is essential. Driving at the posted limit is not automatically safe when visibility is limited.

Question 36Road rules and traffic signs

You are driving behind a cyclist on a road with a marked bicycle lane to your left. How should you pass the cyclist?

  1. Pass closely so you spend less time beside the cyclist
  2. Wait until it is safe and leave a generous lateral gap when overtaking Correct answer.
  3. Follow closely until the cyclist moves onto the footpath
  4. Overtake immediately by moving into the bicycle lane

Explanation

When overtaking a cyclist you must leave a safe lateral distance, which generally means allowing at least a metre at lower speeds and more at higher speeds. If there is not enough room, wait until it is safe to pass. Cyclists can be affected by wind gusts and may need to swerve around hazards.

Question 37Road rules and traffic signs

You are parked on the side of a road and want to rejoin the traffic. What must you do?

  1. Wait for a pedestrian to wave you out
  2. Reverse into the traffic flow to gain momentum
  3. Signal, check mirrors and blind spots, and give way to traffic already on the road Correct answer.
  4. Pull out immediately because you have signalled your intention

Explanation

A vehicle entering the traffic stream from a parked position must give way to vehicles already on the road. Signal your intention, check mirrors and blind spots, and move out only when there is a safe gap. Other drivers are not obliged to slow down for you.

Question 38Road rules and traffic signs

What does a sign showing a black cross on a yellow background with the words 'railway crossing' warn you about?

  1. A bridge with a weight limit is ahead
  2. A railway level crossing is ahead and you should prepare to stop if required Correct answer.
  3. A hospital zone begins at the next intersection
  4. A four-way intersection is approaching

Explanation

The railway crossing warning sign alerts drivers to tracks ahead so they can slow down and check for trains. You should be ready to stop if lights, boom gates or an approaching train require it. Never enter a crossing unless you can clear it completely.

Question 39Road rules and traffic signs

You are driving on a multi-lane road and a lane is marked with a painted arrow pointing straight ahead. You want to turn right from that lane. What should you do?

  1. Reverse out of the lane and find another route
  2. Stop in the lane and wait for other drivers to let you turn
  3. Turn right from the straight-ahead lane if you signal clearly
  4. Follow the arrow and turn right only from a lane marked for right turns Correct answer.

Explanation

Painted lane arrows direct traffic into the permitted movement for each lane. If your lane is marked straight ahead, you must proceed straight and use a lane marked for right turns to make that turn. Turning across other lanes from the wrong position endangers everyone nearby.

Question 40Road rules and traffic signs

You are approaching a school crossing where a crossing supervisor is holding up a stop sign. What must you do?

  1. Stop and remain stopped until the sign is lowered and the crossing is clear Correct answer.
  2. Continue slowly if no children are visible
  3. Drive around the supervisor on the far side of the road
  4. Sound your horn to warn children and proceed

Explanation

When a crossing supervisor displays a stop sign, drivers must stop and stay stopped until the sign is withdrawn. This applies even if you cannot see children at that moment. Proceeding early puts children at serious risk.

Question 41Road rules and traffic signs

You are driving in fog during the day. Which lights should you use?

  1. Low beam headlights, and fog lights if your vehicle has them Correct answer.
  2. Parking lights alone to save the battery
  3. Hazard warning lights only while moving
  4. High beam headlights to see further ahead

Explanation

In fog, low beam headlights help you see and be seen without reflecting glare back at you. High beam reflects off the fog and reduces visibility for you and oncoming drivers. Fog lights may be used in addition where fitted, but they do not replace headlights.

Question 42Road rules and traffic signs

You are travelling on a road with a median strip and see a broken white line marking a turn lane on your right. How should you use this lane?

  1. Enter it only when preparing to turn right and when it is clear Correct answer.
  2. Stay in it for as long as you like after turning
  3. Use it as a normal through lane to bypass congestion
  4. Use it to overtake vehicles travelling straight ahead

Explanation

A marked turn lane is provided so turning vehicles can wait without blocking through traffic. You should enter it only when you intend to turn and it is safe to do so. Using it to bypass queued traffic is unsafe and generally unlawful.

Question 43Road rules and traffic signs

A vehicle is stopped ahead of you at a pedestrian crossing and its brake lights are on. What should you do?

  1. Drive around it on the left shoulder
  2. Overtake the stopped vehicle immediately
  3. Slow down and prepare to stop, as a pedestrian may be crossing in front of it Correct answer.
  4. Sound your horn to make the driver move on

Explanation

A vehicle stopped at a pedestrian crossing may be giving way to someone you cannot see. You must not overtake a vehicle stopped at a crossing, as this is a common cause of serious injury. Slow down and be ready to stop until you can see the crossing is clear.

Question 44Road rules and traffic signs

You are driving on a road with a solid yellow line on your side of the centre. What does this mean for overtaking?

  1. You may cross it to overtake if the road ahead looks clear
  2. You may cross it only to pass slow-moving trucks
  3. You must not cross the line to overtake another vehicle Correct answer.
  4. You may cross it whenever you are below the speed limit

Explanation

A solid line on your side of the centre line means you must keep to your side and must not cross it to overtake. The restriction exists because sight distance or road conditions make overtaking unsafe. You may cross a solid line only in limited circumstances such as turning into a driveway, where permitted.

Question 45Road rules and traffic signs

You are waiting at a red light and want to turn left. There is no left-turn arrow. When may you turn?

  1. When the light turns green and you have given way to pedestrians and traffic Correct answer.
  2. Immediately, because left turns are always permitted at red lights
  3. When the crossing traffic has stopped for their red light
  4. At any time if you slow down and check for pedestrians

Explanation

Without a dedicated arrow, a left turn must wait for the green signal. You must also give way to pedestrians crossing the road you are entering and to any traffic with priority. Turning on a red light is not permitted unless a sign specifically allows it.

Question 46Road rules and traffic signs

You are towing a trailer on a highway and a line of vehicles has formed behind you. What should you do?

  1. Pull over where it is safe and let the queue pass Correct answer.
  2. Wave the vehicles past on a blind bend
  3. Speed up beyond the limit to keep the queue behind you
  4. Ignore them because you have the same right to the road

Explanation

Slow-moving vehicles should allow faster traffic to pass when a queue builds up and it is safe to do so. Pulling over at a suitable place reduces frustration and the risk of dangerous overtaking. Never wave vehicles past where visibility is poor.

Question 47Road rules and traffic signs

You are driving at night on an unlit road and see a pedestrian walking along the left edge ahead. What should you do?

  1. Maintain speed and sound your horn to warn them
  2. Switch to high beam and continue at the same speed
  3. Move closer to the left edge to pass them
  4. Reduce speed, move right if safe and prepare to stop Correct answer.

Explanation

Pedestrians are hard to see at night, so you should slow down and give them plenty of space. Move to the right within your lane if it is safe, and be ready to stop if they step out. High beam can dazzle them and reduce their ability to see.

Question 48Road rules and traffic signs

You are driving in a lane that ends ahead and must merge with traffic in the continuing lane. What is the safest approach?

  1. Adjust speed and position early to merge into a safe gap, giving way if required Correct answer.
  2. Stay in the ending lane until it runs out and then swerve across
  3. Stop at the end of the lane and wait for a large gap
  4. Accelerate to the end of the lane and force your way in

Explanation

When your lane ends, plan ahead and merge smoothly into a suitable gap rather than leaving it to the last moment. Adjusting speed early gives other drivers time to see and respond to you. Forcing your way in or stopping abruptly creates conflict and risk.

Question 49Road rules and traffic signs

You are driving on a wet road and approach a large puddle covering your lane. What is the safest action?

  1. Swerve sharply into the adjacent lane without checking
  2. Slow down before the puddle and avoid sudden braking or steering while crossing it Correct answer.
  3. Brake firmly while driving through the puddle
  4. Accelerate hard to skim across the surface

Explanation

Standing water can cause aquaplaning, where the tyres lose contact with the road and steering and braking become ineffective. Reduce speed before reaching the water and avoid abrupt inputs while crossing. A sharp swerve without checking mirrors and blind spots risks a collision.

Question 50Road rules and traffic signs

You are approaching an intersection where the traffic lights have failed completely. How should you proceed?

  1. Slow down and apply the give-way rules as if the intersection were uncontrolled Correct answer.
  2. Treat the intersection as a four-way stop for all directions
  3. Proceed through at the speed limit because the lights are off
  4. Stop and wait for a police officer to arrive before moving

Explanation

When signals fail, the intersection reverts to the normal give-way rules that apply without lights. Slow down, be prepared to stop and give way to traffic with priority. Waiting indefinitely or assuming a different rule set can cause confusion and collisions.