Traffic Signs, Signals, and Road Markings

482 questions

Question 381Question

Before making a right turn at an intersection controlled by a steady circular red traffic light where right turns on red are permitted, what action must a driver take first?

Show answer & explanation

Answer: Come to a complete stop, yield the right-of-way to pedestrians and oncoming traffic, and proceed when safe.

Answer

Come to a complete stop, yield the right-of-way to pedestrians and oncoming traffic, and proceed when safe.
Under standard traffic laws, turning right on a steady red light is permitted only after making a full, complete stop at the stop line or crosswalk and yielding the right-of-way to any oncoming vehicles, bicyclists, and pedestrians.

Step-by-Step Solution

1
Identify the intersection signal state and turning intention.
The driver intends to turn right at a steady circular red light.
Traffic laws govern driver requirements based on signal color and direction.
2
Apply the standard rule for turning right on red.
The vehicle must come to a full and complete stop prior to entering the crosswalk or intersection.
Stopping allows the driver to evaluate intersection safety and pedestrian presence.
3
Yield right-of-way and complete the turn.
Yield to all pedestrians, bicyclists, and cross-traffic, proceeding only when clear.
Traffic moving on a green light and pedestrians crossing with the signal have right-of-way priority.

Key Concept

Right Turn on Red Legal Procedure
Estimated Time:45s
Question 382Question

When approaching an intersection controlled by a continuously flashing circular yellow traffic light, drivers are legally required to bring their vehicle to a complete stop before entering the intersection.

Show answer & explanation

Answer: False

Answer

The statement is False. A flashing circular yellow traffic light requires drivers to slow down and proceed with caution, not to make a mandatory complete stop.
The statement is false because a flashing circular yellow traffic signal warns drivers of potential hazards ahead and requires them to slow down and proceed with caution. Unlike a flashing red signal or a stop sign, it does not require drivers to come to a complete stop before entering the intersection unless necessary to yield the right-of-way.

Step-by-Step Solution

1
Identify the signal type and its specific legal meaning under traffic laws.
A flashing circular yellow signal serves as a general caution warning for approaching drivers.
Traffic light signals use color and illumination patterns (solid vs. flashing) to communicate required driver actions.
2
Distinguish between a flashing yellow signal and a flashing red signal.
A flashing red light mandates a complete stop, whereas a flashing yellow light permits continued movement with heightened vigilance.
Confusing flashing yellow with flashing red is a common driver error regarding right-of-way and stopping duties.
3
Evaluate the required driver response against the statement's claim.
Because a complete stop is not mandatory for a flashing yellow signal, the statement is false.
Drivers are only required to stop at a flashing yellow light if yielding to pedestrians or avoiding an immediate hazard.

Key Concept

Flashing Yellow Light Legal Duty (Caution vs. Mandatory Stop)
Question 383Question

You arrive at an intersection intending to turn left. The overhead traffic light displays a solid circular green signal, and vehicles are approaching from the opposite direction. Which of the following describes the legally required driver action?

Show answer & explanation

Answer: Yield the right-of-way to oncoming traffic and pedestrians, completing the turn only when a safe gap exists.

Answer

Yield the right-of-way to oncoming traffic and pedestrians, completing the turn only when a safe gap exists.
A solid green circular signal permits a driver to make a left turn, but the turn is unprotected. Under traffic law, drivers executing an unprotected left turn must yield the right-of-way to all oncoming vehicles close enough to constitute a hazard, as well as pedestrians in the crosswalk, before completing the maneuver.

Step-by-Step Solution

1
Identify the signal type and intended maneuver.
The signal is a solid circular green light and the intended action is a left turn across oncoming lanes.
Different light shapes (circular vs. arrow) dictate whether right-of-way is protected or unprotected.
2
Apply right-of-way rules for a solid circular green light.
Recognize that a solid circular green signal indicates an unprotected left turn.
Traffic traveling straight through from the opposite direction has the right-of-way over turning traffic.
3
Determine the required driver behavior.
Yield to all approaching oncoming vehicles and pedestrians crossing the street, then complete the turn when safe.
Traffic safety laws mandate yielding until a sufficient gap in traffic allows safe completion of the maneuver.

Key Concept

Unprotected Left Turns at Solid Green Signals
Estimated Time:1m 0s
Question 384Question

In a temporary road work zone, a flagger displaying a STOP/SLOW paddle with the 'SLOW' side facing oncoming traffic requires drivers to bring their vehicle to a complete stop before proceeding.

Show answer & explanation

Answer: False

Answer

False. Displaying the 'SLOW' face of a flagger paddle instructs drivers to reduce speed and drive with extra caution through the work zone, not to come to a full stop.
The statement is false because a flagger holding the 'SLOW' side of a paddle is instructing motorists to reduce speed and proceed with heightened caution, not to bring the vehicle to a complete stop.

Step-by-Step Solution

1
Identify the specific device face displayed by the traffic control flagger.
The flagger is presenting the 'SLOW' face of a dual-sided STOP/SLOW paddle to approaching traffic.
Flaggers use distinct paddle faces to give distinct operational directions to drivers.
2
Apply the traffic rule corresponding to the 'SLOW' paddle signal.
Drivers must slow down and move through the area alertly without stopping unless obstacles or further directions require it.
A full stop is legally required only when the 'STOP' side is displayed or when hand signals explicitly command a stop.

Key Concept

Temporary Control Devices and Flagger Paddle Indications
Question 385Question

While driving on a two-lane roadway, you encounter a centerline with a solid yellow line on your side of the road. What is the rule regarding passing in this situation?

Show answer & explanation

Answer: You are prohibited from crossing the solid yellow line to pass other vehicles.

Answer

You are prohibited from crossing the solid yellow line to pass other vehicles.
A solid yellow line painted on your side of the centerline designates a no-passing zone. Drivers traveling on that side of the road must not cross the line to overtake or pass another vehicle.

Step-by-Step Solution

1
Identify the pavement marking
The road features a solid yellow line on the driver's side of the centerline.
Yellow centerlines separate traffic moving in opposite directions, and line patterns (solid vs. broken) define passing permissions.
2
Apply the statutory passing rule
A solid yellow line on your side creates a strict no-passing zone.
Drivers are prohibited from crossing a solid yellow line on their side to overtake or pass other vehicles.

Key Concept

Centerline Markings and Passing Rules
Estimated Time:45s
Question 386Question

A driver is legally permitted to enter a designated center left-turn lane to overtake and pass slower vehicles traveling in the same direction.

Show answer & explanation

Answer: False

Answer

False. Designated center left-turn lanes are reserved strictly for left-turning maneuvers and may never be used for passing or overtaking other vehicles.
Center left-turn lanes are meant solely for slowing down to turn left or entering traffic from a driveway or side street. They are not passing lanes.

Step-by-Step Solution

1
Identify the legal function of a center left-turn lane
Center turn lanes (bounded by solid outer and broken inner yellow lines) allow drivers from both directions to safely prepare for left turns.
Pavement markings designate specific lane uses to prevent head-on conflicts.
2
Evaluate whether passing is permitted in this lane
Using the center turn lane to pass other vehicles is prohibited by traffic law.
Vehicles traveling in opposing directions share this lane to make left turns, making passing attempts extremely hazardous.

Key Concept

Center Left-Turn Lane Use and Restrictions
Question 387Question

A rectangular regulatory sign displaying the message 'PASS WITH CARE' establishes a legal prohibition against overtaking and passing other vehicles on the road.

Show answer & explanation

Answer: False

Answer

False. The 'PASS WITH CARE' regulatory sign indicates that a no-passing zone has ended, allowing drivers to overtake vehicles when safe.
The statement is false because a 'PASS WITH CARE' sign notifies drivers that a no-passing zone has ended and that passing is permitted when safe.

Step-by-Step Solution

1
Identify the purpose of the 'PASS WITH CARE' regulatory sign.
Recognize that 'PASS WITH CARE' signifies the termination of a previously enforced 'DO NOT PASS' zone.
Regulatory signs inform motor vehicle operators of specific legal permissions and prohibitions.
2
Determine whether the sign prohibits or permits passing maneuvers.
The sign permits drivers to pass slower vehicles, provided they check for oncoming traffic and exercise proper caution.
Understanding sign definitions prevents misinterpretation of traffic control devices.

Key Concept

Regulatory Sign Meanings - Pass With Care
Question 388Question

A motorist approaches a marked mid-block crosswalk equipped with yellow Rectangular Rapid Flashing Beacons (RRFBs) that have just been activated by a pedestrian at the curb. What action is the driver legally required to take upon seeing the flashing beacons?

Show answer & explanation

Answer: Stop and yield the right-of-way to any pedestrian crossing or entering the crosswalk, proceeding only after pedestrians have safely cleared the path.

Answer

The driver must stop and yield the right-of-way to pedestrians crossing or entering the crosswalk, proceeding once the pedestrians have safely cleared the vehicle's path.
When Rectangular Rapid Flashing Beacons (RRFBs) are activated at a crosswalk, drivers must yield right-of-way and stop for pedestrians. Once pedestrians have safely cleared the vehicle's lane and direction of travel, the driver may proceed.

Step-by-Step Solution

1
Identify the signal type and active state
Rectangular Rapid Flashing Beacons (RRFBs) are actively flashing yellow at a pedestrian crosswalk.
Actuated RRFBs signal that a pedestrian is currently utilizing or preparing to enter the crosswalk.
2
Determine legal driver obligations for activated crosswalk beacons
Motorists must yield right-of-way and bring the vehicle to a stop to allow pedestrians to cross safely.
Traffic laws dictate that rapid yellow flashing crosswalk beacons reinforce mandatory pedestrian right-of-way rules.
3
Determine when proceeding is legally permitted
Motorists may move forward once pedestrians have safely cleared the travel lane and path of the vehicle.
Drivers are not legally obligated to stay stopped until the beacon timer fully expires if the crosswalk is clear.

Key Concept

Rectangular Rapid Flashing Beacon (RRFB) Driver Compliance and Pedestrian Right-of-Way
Estimated Time:1m 0s
Question 389Question

If a pedestrian has already stepped into a marked crosswalk while the solid 'WALK' signal was displayed, they are legally allowed to finish crossing when the signal changes to a flashing upraised hand ('DON'T WALK') with a numerical countdown, and drivers must yield to them.

Show answer & explanation

Answer: True

Answer

True
The statement is true because standard traffic safety laws grant right-of-way to pedestrians who start crossing on 'WALK' so they may finish crossing safely during the flashing 'DON'T WALK' countdown phase. Drivers are legally required to yield until the pedestrian reaches the sidewalk.

Step-by-Step Solution

1
Analyze the pedestrian's starting position relative to the signal phase.
The pedestrian legally entered the crosswalk during the active 'WALK' signal.
Right-of-way rules depend on when the pedestrian initiated crossing relative to the signal state.
2
Evaluate the meaning of the flashing upraised hand ('DON'T WALK') with a countdown timer.
This phase alerts pedestrians on the sidewalk not to start crossing, while permitting pedestrians already in the crosswalk to finish crossing.
The countdown display indicates the remaining time for pedestrians currently in the street to reach the opposite curb safely.
3
Determine driver legal responsibilities.
Drivers must yield the right-of-way to pedestrians who are legally within the crosswalk until they have safely cleared the vehicle's path.
Motorists must always exercise due care and yield to pedestrians who entered the crosswalk legally.

Key Concept

Pedestrian Countdown Signal Right-of-Way Rules
Question 390Question

You enter an intersection where a working traffic signal displays a solid green light, but a police officer directing traffic explicitly motions for you to stop. Which action must you take?

Show answer & explanation

Answer: Bring your vehicle to a complete stop as directed by the officer.

Answer

Bring your vehicle to a complete stop as directed by the officer.
Manual directions given by a uniformed traffic officer or police officer always take priority over automated traffic signals, posted signs, and pavement markings. When an officer signals to stop, drivers must stop regardless of a green signal light.

Step-by-Step Solution

1
Identify the hierarchy of traffic control instructions at the intersection.
Recognize that human traffic officers take precedence over electronic traffic signals and physical signs.
Traffic safety rules establish that manual directions from authorized personnel override standard traffic control devices.
2
Determine the correct driving maneuver.
Follow the police officer's signal and bring the vehicle to a complete stop despite the green light.
Complying with the officer ensures intersection safety during traffic management or unexpected incidents.

Key Concept

Traffic Officer Signal Priority
Estimated Time:45s
Question 391Question

In a designated construction work zone where traffic fines are doubled, a driver is legally permitted to resume normal highway speed immediately after passing the last active construction vehicle, even if an 'END ROAD WORK' sign has not yet been reached.

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Answer: False

Answer

False. Work zone speed limits and doubled fine penalties remain legally binding until passing an official exit sign, such as 'END ROAD WORK', regardless of visible construction activity.
Special zone speed limits and double-fine enforcement remain active throughout the entire designated segment of roadway bounded by entry signs and the exit 'END ROAD WORK' sign.

Step-by-Step Solution

1
Identify how special work zone boundaries are legally established.
Work zones are bounded by official traffic control devices, starting with advance warning signs and concluding with an 'END ROAD WORK' sign.
Traffic laws regulate special zones based on posted regulatory signage rather than driver perception of active construction.
2
Determine the proper driving conduct prior to reaching the exit sign.
Maintain the designated work zone speed limit until passing the 'END ROAD WORK' sign.
Resuming higher speeds before the official end of the zone constitutes a traffic violation subject to doubled fines.

Key Concept

Work Zone Signage Boundaries and Fine Enforcement
Question 392Question

Below are four standard traffic warning sign descriptions and four driver hazard meanings. Pair each warning sign visual description with its corresponding hazard meaning and required driver precaution.

Click a left item, then click its matching right item

Items

Yellow diamond sign displaying two parallel lines that curve inward toward the middle
Yellow diamond sign displaying a truck descending an inclined slope
Yellow circular sign featuring a prominent black 'X' flanked by two 'R' letters
Yellow diamond sign displaying an entering roadway arrow alongside a main lane arrow, separated by a dividing line showing no merge is required

Matches

Show answer & explanation

Answer

1. Yellow diamond with inward-curving lines matches Narrow Bridge ahead. 2. Yellow diamond with a descending truck matches Steep Downgrade ahead. 3. Circular yellow sign with 'X' and 'RR' matches Railroad Advance Warning. 4. Yellow diamond with separate parallel arrows matches Added Lane ahead.
Each pair correctly matches the standard MUTCD symbol description with its regulatory meaning and safe driving response: inward lines indicate a narrow bridge, a descending vehicle indicates a steep grade requiring lower gears, the circular 'RR' sign alerts drivers to an upcoming railroad crossing, and parallel arrows without an intersection line indicate an added lane.

Step-by-Step Solution

1
Identify the standard MUTCD shape and symbol for each warning sign.
Recognize that yellow diamond signs warn of road structure changes (narrow bridge, steep hill, added lane) while circular signs provide advance railroad crossing warnings.
Standardizing shapes and symbols allows drivers to immediately categorize hazard types before reading details.
2
Associate each sign symbol with its intended hazard condition and driver action.
Connect inward lines to reduced width, a downhill truck to grade management, the 'X' and 'RR' to tracks, and parallel non-intersecting arrows to an added lane.
Warning signs require specific preventative actions such as slowing down, checking equipment, or maintaining lane positioning.

Key Concept

Identifying standard warning sign symbols, colors, shapes, and their associated driver precautions
Question 393Question

You arrive at an intersection where the overhead traffic signal is continuously flashing a circular red light. What action must you legally take before driving into the intersection?

Show answer & explanation

Answer: Come to a complete stop at the limit line, yield the right-of-way to pedestrians and oncoming vehicles, and proceed only when it is safe.

Answer

Come to a complete stop at the limit line, yield the right-of-way to pedestrians and oncoming vehicles, and proceed only when it is safe.
A flashing circular red signal requires drivers to make a full stop at the stop line or crosswalk, yield to pedestrians and opposing traffic, and then proceed when clear. It carries the same legal weight as a standard octagonal Stop sign.

Step-by-Step Solution

1
Identify the signal type and its legal meaning
A flashing circular red light legally functions identically to a Stop sign.
Traffic laws dictate that a flashing red signal requires a full vehicle stop prior to entering the crosswalk or intersection.
2
Apply right-of-way rules after stopping
Yield to any pedestrians in the crosswalk and any vehicles that reached the intersection first or pose an immediate hazard.
Stopping fulfills only half of the requirement; drivers must verify the intersection is clear before proceeding.
3
Proceed when safe
Drive safely into the intersection.
Unlike a solid red light, drivers do not need to wait for the signal color to change to green.

Key Concept

Flashing Red Signal Compliance
Question 394Question

When approaching an intersection where the traffic signal is completely unlit and non-operational due to a power outage, drivers must come to a complete stop and treat the intersection as a four-way stop.

Show answer & explanation

Answer: True

Answer

True
When an intersection traffic light goes dark due to a power outage, standard motor vehicle law mandates that every driver must treat the intersection as an all-way stop before proceeding.

Step-by-Step Solution

1
Identify the status of the traffic control device
The traffic signal lights are completely unlit due to a power failure.
Non-functioning traffic signals require specific default right-of-way procedures.
2
Apply the standard traffic rule for unlit signals
The driver must bring their vehicle to a complete stop at the stop line or crosswalk before entering the intersection.
By law, an unlit traffic signal functions equivalent to a four-way stop sign.

Key Concept

Handling unlit non-operational traffic signals as an all-way stop
Estimated Time:45s
Question 395Question

A driver is traveling on a multi-lane roadway and approaches a section posted with a white rectangular regulatory sign reading 'CENTER LANE LEFT TURN ONLY'. Which of the following actions is legally permitted for a driver utilizing this center lane?

Show answer & explanation

Answer: Entering the center lane for a brief distance to prepare for and execute a left turn into a driveway or side street.

Answer

Entering the center lane for a brief distance to prepare for and execute a left turn into a driveway or side street.
The option stating that drivers may enter the lane for a brief distance to prepare for and execute a left turn into a driveway or side street correctly states the legal purpose of a shared center turn lane under regulatory sign enforcement.

Step-by-Step Solution

1
Identify the type and regulatory meaning of the sign.
The white rectangular sign reading 'CENTER LANE LEFT TURN ONLY' is a mandatory regulatory sign governing lane usage.
Regulatory signs inform drivers of specific laws and mandatory lane operational rules.
2
Evaluate the permissible legal uses of a shared center left-turn lane.
Drivers may only enter this lane to make a left turn into or from an intersection, alley, or private driveway, typically within a maximum recommended distance (e.g., 200 feet).
Using the lane for passing, through-travel, or long-distance driving violates regulatory lane restrictions and creates collision risks with opposing traffic.

Key Concept

Shared Center Left-Turn Lane Regulatory Rules
Question 396Question

A driver approaches an intersection controlled by a red-and-white inverted triangular YIELD sign. As the driver reaches the intersection, the roadway is completely clear of oncoming vehicles, cyclists, and pedestrians. What is the driver legally required to do in this situation?

Show answer & explanation

Answer: Slow down and proceed through the intersection without coming to a complete stop, while remaining prepared to yield if cross traffic appears.

Answer

Slow down and proceed through the intersection without coming to a complete stop, while remaining prepared to yield if cross traffic appears.
A YIELD sign mandates that drivers reduce speed and yield the right-of-way to pedestrians and approaching traffic. If the intersection is clear of all conflicting traffic and pedestrians, the driver may proceed smoothly through the intersection without bringing the vehicle to a complete stop.

Step-by-Step Solution

1
Identify the regulatory sign type and its legal definition.
An inverted triangular sign is a regulatory YIELD sign.
Regulatory signs establish legal duties; YIELD requires slowing down and ceding right-of-way.
2
Evaluate the current roadway and traffic conditions at the intersection.
The roadway is completely clear of oncoming vehicles, cyclists, and pedestrians.
Right-of-way duties apply when conflicting traffic is present.
3
Determine the proper driver action based on the sign rule and conditions.
The driver must reduce speed and proceed carefully without making an unnecessary complete stop.
Unlike a STOP sign, a YIELD sign permits continuous movement if the path is clear.

Key Concept

Regulatory Duty of a Yield Sign
Estimated Time:1m 0s
Question 397Question

You are driving on a multi-lane highway next to a High-Occupancy Vehicle (HOV) carpool lane marked with painted white diamonds. The HOV lane is separated from your lane by a double solid white line. What is the legally required action if you wish to enter the HOV lane?

Show answer & explanation

Answer: Remain in your current lane until reaching a designated entry area marked by broken white lines.

Answer

Remain in your current travel lane until you reach a designated entry/exit zone marked by broken white lines.
A double solid white line defines a restricted buffer zone where lane changing into or out of preferential HOV carpool lanes is strictly prohibited. Drivers must remain in their travel lane until encountering a designated entry/exit section marked by broken white lines.

Step-by-Step Solution

1
Identify the specific pavement marking separating the general travel lane from the HOV special zone lane.
Recognize that a double solid white line separates the lanes.
Solid lines indicate restrictions on lane changing.
2
Apply traffic regulations regarding double solid pavement markings for preferential zones.
Determine that crossing double solid white lines is illegal under any circumstances.
Preferential lanes require drivers to enter and exit only at designated broken white line transition areas.

Key Concept

High-Occupancy Vehicle (HOV) Lane Access Rules and Double Solid Line Restrictions
Question 398Question

While driving toward an intersection controlled by a steady red traffic light, a law enforcement officer directing traffic explicitly gestures for you to proceed through. Which action must you take?

Show answer & explanation

Answer: Follow the officer's instructions and proceed carefully through the intersection.

Answer

Follow the officer's instructions and proceed carefully through the intersection.
Whenever a police officer or authorized traffic officer is manually directing traffic, their instructions take precedence over all standard traffic signals, signs, and pavement markings. Drivers are legally required to follow the officer's direction even when it contradicts a steady red light.

Step-by-Step Solution

1
Identify the conflict between the automated traffic control device (steady red light) and the active manual control by a law enforcement officer.
Recognize that a traffic officer is actively managing traffic movement at the intersection.
Traffic laws establish clear priority rules for conflicting traffic control inputs.
2
Apply the rule governing signal priority.
The officer's hand signals override the steady red traffic light.
Direct instructions from authorized law enforcement personnel always supersede physical signals, signs, and pavement markings.

Key Concept

Traffic Officer Signal Priority
Estimated Time:45s
Question 399Question

As you approach an intersection controlled by a yield sign, you observe a row of solid white triangles painted transversely across your lane pointing toward your vehicle. What do these pavement markings indicate?

Show answer & explanation

Answer: A yield line requiring you to yield the right-of-way to cross traffic or pedestrians before proceeding.

Answer

The painted white triangles indicate a yield line where drivers must yield the right-of-way to oncoming or conflicting traffic and pedestrians before crossing.
The correct option identifies the row of solid white triangles as a yield line (also known as shark's teeth). Painted across travel lanes at intersections and roundabouts, these triangles point toward approaching vehicles to indicate where drivers must yield the right-of-way to crossing traffic or pedestrians.

Step-by-Step Solution

1
Identify the orientation and shape of the pavement marking.
The markings consist of a row of solid white triangles painted across the lane pointing toward approaching vehicles.
Recognizing the standardized visual appearance of transverse pavement markings establishes their legal function.
2
Recall the legal meaning of transverse solid white triangles (yield line / shark's teeth).
These markings denote the point at which a driver must yield the right-of-way.
Yield lines specify the point of yielding at intersections, roundabouts, and pedestrian crossings.
3
Distinguish yield line requirements from stop line requirements.
Drivers must slow down and stop if necessary to yield, but a complete stop is not mandatory if no conflicting traffic or pedestrians are present.
Unlike a single solid stop line, a yield line requires stopping only when yielding right-of-way is necessary.

Key Concept

Yield Lines (Shark's Teeth Pavement Markings)
Estimated Time:1m 0s
Question 400Question

A red and white square regulatory sign displaying the phrase 'DO NOT ENTER' indicates that a driver is approaching a one-way roadway or ramp where traffic is traveling in the opposite direction, making it illegal to proceed past the sign.

Show answer & explanation

Answer: True

Answer

The statement is true. A 'DO NOT ENTER' sign legally prohibits vehicles from entering a roadway or ramp where traffic moves in the opposite direction.
The statement accurately describes the legal meaning of the 'DO NOT ENTER' regulatory sign, which prohibits entry onto ramps or streets carrying traffic in the opposite direction.

Step-by-Step Solution

1
Identify the standard shape, color, and message of the regulatory sign in question.
A square sign with a red circle and white lettering reading 'DO NOT ENTER' is a standard regulatory sign.
Regulatory signs specify mandatory traffic laws and direction restrictions.
2
Determine the legal meaning and driver obligation associated with the 'DO NOT ENTER' sign.
The sign explicitly prohibits traffic from proceeding onto a roadway, highway exit ramp, or one-way street where traffic travels in the opposing direction.
Driving past this sign puts the vehicle in direct path of opposing traffic.

Key Concept

Meaning and legal obligation of 'DO NOT ENTER' regulatory signs
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