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DC DMV Permit Test study materials
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DC DMV Permit Test practice questions

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Question 1Traffic laws

Under District of Columbia law, what must a driver do when an emergency vehicle with flashing lights and a siren approaches from behind?

  1. Stop immediately in the travel lane wherever the driver happens to be
  2. Maintain speed and stay in the lane so the emergency vehicle can pass on either side
  3. Pull over to the right edge of the roadway and stop until it passes Correct answer.
  4. Speed up to reach the next intersection before the emergency vehicle arrives

Explanation

DC law requires drivers to yield the right-of-way to emergency vehicles operating with lights and siren by pulling as close as practicable to the right-hand edge of the roadway and stopping. Staying stopped in a travel lane blocks the path and creates a hazard. Drivers should remain stopped until the emergency vehicle has passed.

Question 2Traffic laws

What is the maximum speed limit on most undivided streets in the District of Columbia unless a sign posts a different limit?

  1. 20 mph
  2. 30 mph
  3. 35 mph
  4. 25 mph Correct answer.

Explanation

The default speed limit on DC streets is 25 mph unless otherwise posted. Higher limits apply only where signs specifically allow them, such as certain major arterials. Drivers must always reduce speed below the limit when conditions require it.

Question 3Traffic laws

In the District of Columbia, a driver approaching a steady red traffic light must come to a complete stop and may then:

  1. Proceed straight through if no vehicles are visible
  2. Turn right after stopping and yielding to pedestrians and other traffic Correct answer.
  3. Turn left after yielding to oncoming traffic
  4. Turn right only after waiting for a green arrow

Explanation

A right turn on red is permitted in DC after a full stop, provided the driver yields to pedestrians in the crosswalk and to other traffic. A left turn on red is generally not allowed except from a one-way street onto another one-way street. Turning right does not require a green arrow.

Question 4Traffic laws

When two vehicles arrive at an uncontrolled intersection at about the same time, which driver has the right-of-way?

  1. The driver who honks first
  2. The driver traveling faster
  3. The driver on the left
  4. The driver on the right Correct answer.

Explanation

At an intersection without signs or signals, the driver on the left must yield to the vehicle on the right. This rule prevents collisions when arrival times are essentially simultaneous. Speed and horn use do not establish right-of-way.

Question 5Traffic laws

What does a solid double yellow line in the center of a roadway indicate?

  1. The road becomes one-way ahead
  2. The lane nearest the line is reserved for buses
  3. Traffic in both directions may not cross the line to pass Correct answer.
  4. Passing is permitted in both directions when clear

Explanation

Double solid yellow lines separate traffic moving in opposite directions and prohibit crossing them to overtake another vehicle. They may be crossed only for limited purposes such as turning into a driveway where permitted. They do not indicate a bus-only lane or a one-way road.

Question 6Traffic laws

In the District of Columbia, a driver must use seat belts and must ensure that children under what age are secured in an approved child restraint?

  1. Under 4 years old
  2. Under 8 years old Correct answer.
  3. Under 12 years old
  4. Under 16 years old

Explanation

DC law requires an approved child safety seat for children under 8 years old, and the child must be properly secured. Older children must use a seat belt. The driver is responsible for ensuring all passengers are restrained.

Question 7Traffic laws

A flashing red traffic signal should be treated the same as which of the following?

  1. A green light
  2. A stop sign Correct answer.
  3. A flashing yellow light
  4. A yield sign

Explanation

A flashing red light requires a complete stop, after which the driver may proceed when it is safe, exactly like a stop sign. A flashing yellow light, by contrast, means proceed with caution without a mandatory stop.

Question 8Traffic laws

When a school bus is stopped with its red lights flashing on a two-lane road, what must a driver traveling in the opposite direction do?

  1. Stop until the red lights stop flashing Correct answer.
  2. Change lanes and continue at the same speed
  3. Slow down and proceed with caution
  4. Honk to warn children and continue

Explanation

On an undivided two-lane road, traffic in both directions must stop for a school bus displaying flashing red lights. The stop protects children entering or leaving the bus. Drivers may proceed only after the red lights are turned off.

Question 9Traffic laws

A driver approaching a steady yellow traffic light that cannot be safely stopped should:

  1. Stop abruptly in the intersection
  2. Proceed through the intersection with caution Correct answer.
  3. Reverse to the previous intersection
  4. Accelerate hard to clear the intersection

Explanation

A steady yellow light warns that the signal is changing to red. If the driver is too close to stop safely, the correct action is to continue through the intersection with caution. Slamming on the brakes or speeding up sharply can cause a collision.

Question 10Traffic laws

A pedestrian is crossing a DC street at a marked crosswalk without a traffic signal. What is the driver's obligation?

  1. Yield and stop to let the pedestrian cross Correct answer.
  2. Proceed if the driver arrives first
  3. Drive around the pedestrian in the adjacent lane
  4. Sound the horn so the pedestrian hurries

Explanation

Drivers must yield the right-of-way to pedestrians crossing in a marked crosswalk. The pedestrian's presence in the crosswalk creates a duty to stop, regardless of who arrived first. Honking or driving around the pedestrian is unsafe and may violate the law.

Question 11Traffic laws

A driver planning to turn left at an intersection with a green circular light must:

  1. Turn from the right lane to shorten the path
  2. Wait for a green arrow in every case
  3. Turn immediately without checking oncoming traffic
  4. Yield to oncoming traffic and pedestrians before turning Correct answer.

Explanation

A green circular light allows a left turn only after yielding to oncoming vehicles and to pedestrians in the crosswalk. A green arrow, when present, gives protected right-of-way. Turning from the right lane is improper positioning.

Question 12Traffic laws

On a four-lane highway with two lanes in each direction, a driver may use the left lane primarily for:

  1. Parking briefly while making deliveries
  2. Overtaking and passing slower vehicles Correct answer.
  3. Driving below the minimum speed
  4. Making U-turns at any point

Explanation

The left lane on a multi-lane highway is intended for passing and overtaking slower traffic, not for cruising below the flow of traffic. Parking and U-turns are prohibited on highways. Drivers should return to the right lane when it is safe.

Question 13Traffic laws

What is the proper action when an authorized school crossing guard raises a stop paddle in the roadway?

  1. Slow down and drive around the guard
  2. Stop and remain stopped until the guard lowers the paddle Correct answer.
  3. Continue if no children are visible
  4. Stop only if the guard is in your lane

Explanation

A crossing guard's stop paddle has the force of a traffic control signal, and drivers must stop and remain stopped until the guard signals them to proceed. The absence of visible children does not permit proceeding. Driving around the guard is unsafe and unlawful.

Question 14Traffic laws

When may a driver legally pass another vehicle on the right on a multi-lane roadway?

  1. Only when the vehicle ahead is stopped at a red light
  2. Never, under any circumstances
  3. When the vehicle ahead is making or preparing for a left turn and there is room to pass safely Correct answer.
  4. Whenever the driver wishes, regardless of lane markings

Explanation

Passing on the right is generally allowed when the vehicle ahead is turning left or preparing to turn left and there is sufficient space to pass safely on the right. Passing on the shoulder or off the roadway is not permitted. Passing on the right is not limited to red-light situations.

Question 15Traffic laws

A driver who strikes an unattended parked vehicle in the District of Columbia must:

  1. Leave a note only if damage exceeds a set amount
  2. Stop and try to locate the owner, or leave written identifying information Correct answer.
  3. Report the incident only if the owner files a complaint
  4. Continue driving and report it within 30 days

Explanation

A driver involved in a collision with an unattended vehicle must stop and attempt to find the owner. If the owner cannot be located, the driver must leave written information identifying themselves and the circumstances. Failing to do so can constitute a hit-and-run offense.

Question 16Traffic laws

In DC, when an authorized emergency vehicle is parked with lights flashing at a crash scene, drivers passing by should:

  1. Sound the horn to alert responders
  2. Maintain highway speed in the adjacent lane
  3. Stop completely in the travel lane
  4. Move over or slow down as required by the move-over law Correct answer.

Explanation

DC's move-over law requires drivers approaching a stopped emergency vehicle with lights flashing to change lanes away from it if possible, or to slow down if a lane change is not safe. This protects responders and crash victims. Honking or stopping in a travel lane creates additional hazards.

Question 17Traffic laws

A driver whose vehicle is equipped with an ignition interlock device may operate the vehicle only if:

  1. A licensed passenger is present
  2. The device has been disconnected
  3. The driver provides a breath sample below the set alcohol limit Correct answer.
  4. The trip is shorter than five miles

Explanation

An ignition interlock device prevents the vehicle from starting unless the driver provides a breath sample showing alcohol below the programmed limit. The requirement applies on every trip. Disconnecting the device or relying on a passenger does not satisfy the legal condition.

Question 18Traffic laws

Under DC's zero-tolerance rule, a driver under 21 years of age commits a violation by operating a vehicle with a blood alcohol concentration of at least:

  1. 0.02 percent Correct answer.
  2. 0.01 percent
  3. 0.08 percent
  4. 0.05 percent

Explanation

DC applies a zero-tolerance standard for drivers under 21, making a blood alcohol concentration of 0.02 percent or higher a violation. The 0.08 percent threshold applies to drivers 21 and older. Any detectable alcohol can impair a young driver's judgment.

Question 19Traffic laws

A driver approaching a steady red arrow pointing left must:

  1. Proceed if the intersection appears empty
  2. Stop and wait for a green signal before turning in that direction Correct answer.
  3. Treat it as a yield sign
  4. Turn left after yielding to oncoming traffic

Explanation

A red arrow prohibits movement in the direction it points, so a left turn must wait until a green arrow or other permissive signal appears. A red arrow is not a yield condition and cannot be ignored because traffic appears clear.

Question 20Traffic laws

A bus is stopped in a designated bus lane and displaying a left turn signal while preparing to re-enter traffic. Approaching drivers should:

  1. Yield to the bus when it signals to re-enter traffic Correct answer.
  2. Honk so the bus waits
  3. Drive in the bus lane to bypass congestion
  4. Accelerate to pass before the bus moves

Explanation

Drivers should yield to a bus signaling its intent to re-enter the flow of traffic from a stop, which reduces conflicts and keeps transit moving. Accelerating to pass or honking creates risk. General traffic may not use designated bus lanes.

Question 21Traffic laws

A driver is traveling on a road with a posted 25 mph limit during heavy rain at night. What is the best application of the basic speed law?

  1. Follow the taillights of the car ahead closely
  2. Drive below 25 mph as conditions require to remain safe Correct answer.
  3. Maintain 25 mph because it is the posted maximum
  4. Drive faster to reduce time on the wet road

Explanation

The posted limit is a maximum for ideal conditions, and the basic speed law requires driving at a speed reasonable for the weather, visibility, and road surface. Heavy rain at night calls for reduced speed. Tailgating reduces reaction time and is unsafe.

Question 22Traffic laws

A driver waiting to make an unprotected left turn at a green light enters the intersection as the light turns yellow and then red. What is the safest legal action?

  1. Accelerate across oncoming lanes to beat the cross traffic
  2. Reverse out of the intersection
  3. Complete the turn when oncoming traffic clears and it is safe Correct answer.
  4. Remain stopped in the intersection indefinitely

Explanation

A driver already lawfully within the intersection when the light changes may complete the turn once oncoming traffic clears and it is safe. Reversing or remaining in the intersection blocks cross traffic. Accelerating across oncoming lanes is dangerous.

Question 23Traffic laws

When a traffic signal is dark because of a power outage, how should drivers treat the intersection?

  1. Yield only to vehicles on the left
  2. Proceed at full speed because no signal is displayed
  3. Wait for a police officer before moving at all
  4. Treat it as an all-way stop and proceed in turn Correct answer.

Explanation

A dark traffic signal should be treated as an all-way stop, with each driver stopping and proceeding in order of arrival while yielding as needed. Proceeding at speed or yielding only to the left creates conflicts. Drivers need not wait for an officer if the intersection can be crossed safely.

Question 24Traffic laws

A driver's license is suspended in DC. Which statement best describes the consequence of driving during the suspension?

  1. Driving is permitted if the driver stays under 25 mph
  2. Driving is permitted if a licensed passenger supervises
  3. Driving is unlawful and may result in arrest and additional penalties Correct answer.
  4. Driving is permitted only during daylight hours

Explanation

Operating a vehicle while one's license is suspended or revoked is a criminal offense in DC that can lead to arrest, fines, and extended loss of driving privileges. Speed limits or daylight hours do not create an exception. Supervision by a licensed passenger does not authorize a suspended driver.

Question 25Traffic laws

In the District of Columbia, what is the maximum speed limit in an alley unless a different limit is posted?

  1. 20 mph
  2. 15 mph Correct answer.
  3. 25 mph
  4. 10 mph

Explanation

DC law sets a default 15 mph limit in alleys, which is lower than the general 25 mph default for residential and business streets. Alleys present blind corners and pedestrians stepping out, so the reduced limit applies unless a sign posts something else.

Question 26Traffic laws

A driver in DC approaches a railroad crossing with flashing red lights and a lowered gate. What must the driver do?

  1. Stop, then cross once the bell stops ringing
  2. Slow down and cross if no train is visible
  3. Stop and remain stopped until the lights and gate clear Correct answer.
  4. Proceed around the gate if the crossing arm is only partly down

Explanation

Flashing red lights and a lowered gate mean a train is approaching, and the driver must stop and stay stopped until the signals stop and the gate fully rises. Crossing around or under a gate is unlawful and dangerous because trains cannot stop quickly.

Question 27Traffic laws

On a DC street with no painted lines and no curbs, where should a driver position the vehicle?

  1. On the right half of the roadway Correct answer.
  2. Whichever half has fewer parked cars
  3. In the exact center of the roadway
  4. On the left half of the roadway

Explanation

When a roadway has no markings or curbs defining lanes, DC follows the rule that a driver keeps to the right half of the roadway. This keeps opposing traffic separated even without paint.

Question 28Traffic laws

What does a white painted arrow pointing straight ahead in a travel lane tell a driver?

  1. The lane ends immediately after the arrow
  2. The lane may be used for parking during off-peak hours
  3. The lane is reserved for through movement at the intersection Correct answer.
  4. The lane is for buses only

Explanation

White pavement arrows indicate the direction of travel permitted from that lane, so a straight arrow means through movement only. A driver who needs to turn should be in the lane marked for that turn.

Question 29Traffic laws

In DC, when are headlights required on a vehicle?

  1. Only on roads without streetlights
  2. From sunset to sunrise and whenever visibility is poor Correct answer.
  3. Only between midnight and dawn
  4. Only when it is actively raining

Explanation

Headlights must be on from sunset to sunrise and any time weather, smoke, or other conditions make it hard to see people and vehicles clearly. Many drivers also turn them on in rain because DC requires wipers and headlights together in wet weather.

Question 30Traffic laws

A driver in DC is convicted of a second offense of driving while intoxicated within the lookback period. What is a likely consequence?

  1. Enhanced penalties including mandatory jail time and a longer license revocation Correct answer.
  2. A requirement to retake only the written knowledge test
  3. A fine only, with no effect on the license
  4. A warning letter with no license action

Explanation

Repeat impaired-driving convictions in DC carry escalating consequences, including mandatory minimum jail time, larger fines, and longer license revocations. The penalties grow because repeat offenses show a persistent risk to the public.

Question 31Traffic laws

A driver's vehicle has a defective horn that does not sound. Under DC equipment rules, what is the status of the vehicle?

  1. It is not roadworthy until the horn is repaired Correct answer.
  2. It may be driven because horns are optional equipment
  3. It may be driven if the driver uses hand signals instead
  4. It may be driven only during daylight hours

Explanation

A working horn is required equipment in DC, and a vehicle with a failed horn does not meet the equipment standards for lawful operation. Hand signals address turn signaling but do not substitute for the horn's warning function.

Question 32Traffic laws

A driver in DC is stopped by police and refuses to take a chemical test of breath or blood after a lawful arrest for impaired driving. What is the result under the implied consent law?

  1. The license is subject to revocation for the refusal Correct answer.
  2. The driver automatically receives a warning only
  3. Nothing happens because refusal is a constitutional right with no penalty
  4. The driver may retake the test later that week to avoid consequences

Explanation

By driving in DC, a person consents in advance to chemical testing after a lawful impaired-driving arrest. Refusing the test triggers license revocation proceedings separate from any criminal case, and the refusal can also be used as evidence.

Question 33Traffic laws

A driver in DC wants to turn left from a one-way street onto another one-way street. Where should the driver begin the turn?

  1. From the center lane, turning into the rightmost lane
  2. From the leftmost lane, turning into the leftmost lane Correct answer.
  3. From any lane, turning into the nearest open lane
  4. From the rightmost lane, turning into the rightmost lane

Explanation

A left turn from a one-way street onto another one-way street is made from the leftmost lane and completed into the leftmost lane. This keeps the turn short and avoids crossing other traffic streams.

Question 34Traffic laws

A driver is traveling on a two-lane road and a school bus approaches from the opposite direction with its amber warning lights flashing but its red lights off. What should the driver do?

  1. Slow down and prepare to stop if the red lights activate Correct answer.
  2. Maintain speed because amber lights do not require action
  3. Stop immediately and wait for the bus to pass
  4. Accelerate to clear the area before the red lights come on

Explanation

Amber lights are an advance warning that the bus is about to stop and activate its red lights. The safe response is to slow down and get ready to stop, without stopping while the bus is still moving.

Question 35Traffic laws

A driver in DC is involved in a collision that causes injury to another person. What must the driver do immediately?

  1. Leave the scene to find a phone and return later
  2. Stop, give aid, and report the crash to police Correct answer.
  3. Exchange insurance details only if the other driver asks
  4. Move the injured person and leave without reporting

Explanation

A driver in an injury crash must stop at or near the scene, render reasonable assistance, and notify police. Leaving the scene of an injury collision is a serious offense in DC.

Question 36Traffic laws

A driver in DC is approaching a steady red light and wants to turn right. What condition must be met before the driver may turn?

  1. The driver slows to about 10 mph and turns if the way looks clear
  2. The driver may turn only after the light turns green
  3. The driver stops, yields to pedestrians and traffic, and no sign prohibits the turn Correct answer.
  4. The driver may turn after honking to warn pedestrians

Explanation

A right turn on red is permitted in DC after a full stop, provided there is no sign prohibiting it and the driver yields to pedestrians and cross traffic. The turn is made only when the way is clear.

Question 37Traffic laws

A driver in DC is following a motorcycle at night. What following distance should the driver keep?

  1. More distance than behind a car, because motorcycles stop faster and are harder to see Correct answer.
  2. A closer distance to prevent other vehicles from cutting in
  3. The same distance as behind a car, since stopping distances are identical
  4. A distance of one car length regardless of speed

Explanation

Motorcycles can stop in a shorter distance than cars and are easily hidden by glare and shadows at night. Following farther back gives the driver time to react and keeps the motorcycle visible in the headlights.

Question 38Traffic laws

A driver in DC is parking on a hill facing downhill with a curb present. Which action is correct?

  1. Turn the front wheels away from the curb and set the parking brake
  2. Turn the front wheels toward the curb and set the parking brake Correct answer.
  3. Leave the wheels straight and rely on the transmission
  4. Turn the wheels toward the curb but leave the parking brake off

Explanation

Facing downhill with a curb, the wheels should be turned toward the curb so that if the vehicle rolls it is caught by the curb. The parking brake must also be set.

Question 39Traffic laws

A driver in DC is approaching a work zone with a flagger holding a sign that reads SLOW. What should the driver do?

  1. Change lanes immediately without checking mirrors
  2. Stop completely and wait for the flagger to wave
  3. Maintain the posted speed because the sign is advisory
  4. Reduce speed and proceed with caution as directed Correct answer.

Explanation

A SLOW paddle directs drivers to reduce speed and continue cautiously through the work zone. Work-zone speed limits and flagger directions are enforceable, and fines are increased for violations in work zones.

Question 40Traffic laws

A driver in DC is driving a vehicle with studded snow tires. When may the studs legally be used?

  1. Only during the winter period designated by the District Correct answer.
  2. Only when snow is actively falling
  3. At any time of year if the tires are rated for snow
  4. Only on roads outside the District

Explanation

Studded tires are permitted in DC only during the designated winter months because studs damage pavement and reduce traction on dry roads. Outside that period, the vehicle must run on non-studded tires.

Question 41Traffic laws

A driver in DC is approaching a crosswalk where a pedestrian has stepped into the roadway but has not yet reached the driver's lane. What should the driver do?

  1. Move into the adjacent lane and proceed
  2. Sound the horn to tell the pedestrian to hurry
  3. Stop and wait for the pedestrian to finish crossing Correct answer.
  4. Continue because the pedestrian is not in the driver's lane yet

Explanation

DC law requires drivers to yield to pedestrians in a crosswalk, and a person who has entered the roadway is in the crosswalk for this purpose. Stopping avoids forcing the pedestrian to dodge and satisfies the duty to yield.

Question 42Traffic laws

A driver in DC is being passed by another vehicle on a two-lane road. What must the driver being passed do?

  1. Brake sharply to force the passing vehicle back
  2. Speed up to prevent the other driver from cutting in
  3. Move to the left to give the passing vehicle more room
  4. Keep to the right and maintain speed so the pass can be completed safely Correct answer.

Explanation

The driver being overtaken must hold a steady speed and stay to the right so the passing driver can complete the maneuver. Speeding up or swerving turns a routine pass into a hazard.

Question 43Traffic laws

A driver in DC is stopped at a red light and wants to make a U-turn. When is a U-turn lawful?

  1. Only at intersections controlled by a green arrow
  2. Whenever the light turns green, regardless of signs
  3. When no sign prohibits it and the driver yields to other traffic Correct answer.
  4. Only on one-way streets

Explanation

DC permits U-turns at intersections unless a sign forbids them, but the driver must yield the right of way to other traffic and pedestrians. Many downtown intersections post no-U-turn signs, so drivers must watch for them.

Question 44Traffic laws

A driver in DC is convicted of driving without a valid permit or license. What is a likely consequence for a first offense?

  1. Automatic vehicle forfeiture
  2. A requirement to complete driver education only
  3. A written warning with no record
  4. A fine and possible license suspension Correct answer.

Explanation

Driving without a valid license in DC can result in fines and license suspension, and repeat offenses escalate to jail time. The violation is treated seriously because unlicensed drivers lack demonstrated competence.

Question 45Traffic laws

A driver in DC is traveling on a road with a posted 35 mph limit and sees a sign reading 25 mph in a school zone during posted hours. Which limit applies?

  1. 25 mph, because the school zone limit controls during posted hours Correct answer.
  2. The limit shown on the vehicle's speedometer
  3. Either limit, at the driver's discretion
  4. 35 mph, because the general limit overrides the zone

Explanation

A posted school-zone speed limit replaces the general limit during the hours shown on the sign. Drivers must slow to the lower figure when children are present or the zone is in effect, and fines are increased for violations.

Question 46Traffic laws

A driver in DC is approaching an intersection where the traffic signal is flashing yellow in all directions. How should the driver proceed?

  1. Stop completely before entering the intersection
  2. Slow down and proceed with caution, yielding as needed Correct answer.
  3. Proceed at the posted speed without checking cross traffic
  4. Treat the intersection as a four-way stop

Explanation

A flashing yellow signal warns drivers to slow down and proceed carefully, yielding to traffic and pedestrians already in the intersection. It does not create a full stop requirement the way a flashing red does.

Question 47Traffic laws

A driver in DC is involved in a crash with property damage exceeding the reporting threshold and no one is injured. What is the driver's obligation?

  1. Stop, exchange information, and report the crash as required by law Correct answer.
  2. Report the crash only if police arrive at the scene
  3. Drive on because no injury occurred
  4. Leave a note only if the other driver is absent

Explanation

Even without injuries, a crash above the property-damage threshold requires the driver to stop, exchange identifying and insurance information, and file a report as DC law directs. Leaving without doing so can be treated as leaving the scene.

Question 48Traffic laws

A driver in DC is approaching a yield sign at the entrance to a freeway. Traffic on the freeway is heavy and continuous. What is the correct action?

  1. Accelerate to the freeway speed and merge without checking
  2. Merge immediately and force freeway traffic to adjust
  3. Slow or stop at the end of the ramp and wait for a safe gap Correct answer.
  4. Stop in the travel lane of the freeway until a gap appears

Explanation

A yield sign requires the entering driver to give way to freeway traffic, which may mean slowing or stopping on the ramp until a safe gap appears. Freeway traffic has the right of way, and forcing a merge creates a collision risk.

Question 49Traffic laws

A driver in DC has a blood alcohol concentration of 0.05 percent and is 25 years old. The driver is stopped and shows clear signs of impairment. What is the likely outcome?

  1. A citation only for an open container
  2. No action, because the reading is below 0.08 percent
  3. The driver may still be arrested for impaired driving based on evidence of impairment Correct answer.
  4. Automatic dismissal because the reading is under the legal limit

Explanation

Although 0.08 percent is the per se limit for adults, a driver can still be charged with impaired driving when the observed evidence shows intoxication below that level. The reading is one piece of evidence, not a safe harbor.

Question 50Traffic laws

In the District of Columbia, what does a solid white line between lanes of traffic traveling in the same direction generally indicate?

  1. That parking is allowed along the line during off-peak hours
  2. That the lanes carry traffic moving in opposite directions
  3. Discouragement of lane changes, though crossing is permitted when safe Correct answer.
  4. A complete prohibition on crossing for any reason

Explanation

A solid white line separates lanes moving in the same direction and signals that lane changes are discouraged, but a driver may still cross it when it is safe to do so. A solid yellow line, by contrast, marks the left edge of traffic or separates opposing flows.