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Most-missed New Jersey DMV rules
These are the numbers and rules that trip up new drivers most often on the real New Jersey knowledge test. Every fact below comes from our free New Jersey DMV practice test question bank, which has 180 questions across 9 topics.
Speed limits
- School zones, business districts, and residential districts carry a statutory default of 25 mph.
- N.J.S.A. 39:4-98.6 doubles fines for exceeding a 65 mph limit by 10 mph or more, and for most violations committed in a 65 mph zone.
- N.J.S.A. 39:4-98.6 doubles fines not just for excessive speed but for most moving violations committed inside a 65 mph zone.
- Per the statutory table in the NJ Driver Manual, 65 mph is the top posted limit allowed on certain interstate highways.
- N.J.S.A. 39:4-98 sets 50 mph as the default limit on non-posted rural roadways.
Right of way
- At an uncontrolled intersection in New Jersey, the vehicle on the left must yield to the vehicle approaching from the right.
- A left turn is only permitted after yielding to oncoming vehicles and to pedestrians lawfully in the crosswalk.
- Vehicles entering a road from a driveway, private road, or acceleration lane must yield to traffic already on the main roadway.
- New Jersey law gives pedestrians the right of way at all intersections and marked crosswalks.
- Drivers entering from an acceleration lane must yield to traffic already on the highway and merge at a matching speed for safety.
- Do not cut through or break up a funeral procession. Slow down, be patient, and let it pass. Cutting between the vehicles is unsafe and often illegal.
- At an uncontrolled intersection, slow down and yield to any car already in the intersection or approaching from your right.
- A left-turning vehicle must yield to oncoming through traffic and to pedestrians. Only turn when the gap is safe.
- When entering a roundabout, yield to traffic already circulating and travel counterclockwise. Exit at your street; do not stop in the middle of the circle.
- At a T-intersection, traffic on the road that ends must yield to traffic on the through road that continues.
- A round green light allows a left turn but does not give you the right of way. Pull into the intersection, yield to oncoming through traffic and pedestrians, then turn when there is a safe gap.
Alcohol and DUI
- Under N.J.S.A. 39:4-50, a BAC of 0.08% or higher is illegal per se for drivers 21 and over.
- New Jersey's underage DUI law sets a near-zero-tolerance threshold of 0.01% BAC for drivers under 21 (N.J.S.A. 39:4-50.14).
- For BAC 0.08%-0.099% on a 1st offense, the interlock is required for 3 months, along with a fine of $250-$400 and up to 30 days imprisonment.
- The 0.10%-0.149% bracket requires interlock for 7 months to 1 year, a harsher tier than the 0.08-0.099 bracket which only requires 3 months.
- BAC of 0.15% or higher requires interlock during the 4-6 month suspension and for an additional 9-15 months after restoration.
- A 2nd DWI offense carries a fine of $500-$1,000, jail time up to 90 days, a 1-to-2-year license suspension, and 30 days community service.
- A 3rd DWI offense results in an 8-year license suspension, a $1,000 fine, up to 180 days imprisonment, and a $1,500/year insurance surcharge for 3 years.
- Under N.J.S.A. 39:4-50.15, such a parent/guardian is separately guilty of a disorderly persons offense, loses driving privileges for up to 6 months, and must perform up to 5 days community service.
- A 1st offense open container violation carries a $200 fine; a 2nd offense carries a $250 fine or 10 days community service.
Signals and markings
- A solid yellow line facing your lane prohibits passing, while a broken yellow line allows passing when safe.
- A flashing yellow signal warns drivers to slow down and proceed carefully through the intersection, unlike a dark signal which is treated as a stop.
- A steady red light requires a full stop; cross traffic has the right of way until the light changes.
- On a plain green light, a left-turning driver must yield to oncoming traffic and pedestrians before completing the turn.
- A dashed yellow centerline indicates passing is permitted on that side, provided it can be done safely and there is no oncoming traffic conflict.
- A flashing yellow arrow permits the indicated turn but the driver must first yield to pedestrians and oncoming traffic.
- The manual instructs drivers not to change lanes once inside a roundabout.
- A flashing yellow signal warns drivers to slow down and proceed carefully, unlike a solid red which requires a full stop.
- A steady yellow light warns that the right of way is ending and the signal is about to turn red.
- A flashing red signal is legally equivalent to a stop sign: the driver must come to a full stop before proceeding when clear.
- A solid yellow line on your side of the centerline means you may not cross it to pass; passing is prohibited from that side.
- A steady red light always requires a complete stop before the intersection unless a sign specifically permits turning after stopping.
- A dashed yellow center line indicates passing is generally permitted when it can be done safely, unlike a solid yellow line.
- A flashing yellow arrow is a permissive signal allowing a left turn, but only after yielding to all oncoming traffic and pedestrians/cyclists in the crosswalk.
- A driver turning left must yield the right-of-way to all oncoming traffic, including bicyclists, before completing the turn.
- Headlights are legally required not just at night but any time weather conditions significantly reduce visibility.
- A flashing yellow signal is a caution indicator meaning drivers may proceed but should do so carefully.
- A green arrow grants a protected right of way to complete that turn without yielding to opposing traffic.
- Double solid yellow lines indicate that passing is not permitted from either direction on that stretch of road.
- A flashing yellow light means slow down, look, and proceed carefully. It does NOT require a full stop the way a red light or STOP sign does.
- A flashing hand or countdown means do NOT start crossing. If you are already in the crosswalk, keep going and finish crossing safely.
- A steady DON'T WALK hand prohibits starting to cross. Only a WALK signal or walking-person symbol allows you to begin crossing.
- Always signal continuously through a turn or lane change even when you see no other cars, because pedestrians or cyclists may be near. Cancel the signal after you finish.
- A green downward arrow means the lane is open for you to use. A red X above the lane means it is closed and you may not drive in it.
- Double solid yellow lines separate opposing directions and prohibit passing. You may only cross them for a permitted left turn or a legal U-turn into an intersection or driveway.
- A broken yellow line on your side of the lane allows passing when it is safe. The solid line on the opposite side means that direction may not pass.
- White lines separate lanes going the same direction. A solid white line means stay in your lane and avoid changing lanes, while a broken white line lets you change lanes when safe.
- A two-way center left-turn lane is only for preparing to turn left or merging into traffic. You may not use it to drive straight through or to pass.
Parking
- Parking near fire hydrants is prohibited so firefighters can access them quickly in an emergency.
- Checking mirrors and blind spots before opening a door prevents dooring cyclists or oncoming traffic, a common cause of crashes.
- Parking too close to a crosswalk blocks sightlines for both drivers and pedestrians, so it is restricted within a set distance of the crosswalk.
Safe driving
- New Jersey was the first state to officially launch the Hero Campaign for Designated Drivers, which the manual promotes.
- A minimum 3-second following distance gives drivers enough time to react to sudden braking by the vehicle ahead.
- Hydroplaning is best countered by easing off the accelerator and keeping the steering wheel straight until the tires regain contact with the road.
- On undivided roads, traffic in both directions must stop for a school bus with flashing red lights and an extended stop sign until it resumes moving.
- Because SMV-marked vehicles like tractors move slowly and may turn into fields or driveways, safe practice is to keep distance and watch for signals before passing.
- Posted speed limits are for ideal conditions; drivers should reduce speed further and increase following distance in poor weather like heavy rain or fog.
- The core safety reasoning is that other drivers may not yield as expected, so defensive caution prevents collisions.
- Advisory speed plates on curve warning signs indicate a safe reduced speed that drivers should slow to before entering the curve.
- Defensive driving calls for slowing down and preparing to stop when visibility of intersection controls is uncertain.
- General right-of-way practice, reflected in the manual, is that the first vehicle to arrive and stop proceeds first; simultaneous arrivals yield to the right.
- Rural highways through unfenced farm and ranch land require extra alertness for livestock and wildlife crossing the road.
- Safe driving practice calls for maintaining enough distance behind the vehicle ahead to react and stop safely if it brakes suddenly.
- Because safety corridors have higher serious-crash rates, drivers are encouraged to use headlights on to improve visibility and safety.
- The manual explains posted limits are for ideal conditions, and driving that speed in bad conditions can still be cited as too fast for conditions.
- The manual stresses that no one should ever assume they automatically have the right of way, since other drivers may not yield as expected.
- Work zones are posted at least 10 mph under the normal maximum speed specifically to protect workers and should always be observed.
- A 3 to 4 second following distance gives drivers enough time to react and brake safely under normal conditions.
- The manual warns that leaving a large vehicle's wind-sheltered draft can expose your car to a sudden crosswind push, requiring a steering correction.
- Since farm tractors typically travel around 25 mph, the speed differential requires extra caution and clearance when passing.
- A time based following distance, counting seconds behind the vehicle ahead, adjusts naturally for speed and is the standard safe driving practice.
- Handbooks generally recommend a multi-second following distance that should be increased in bad weather, at higher speeds, or in heavy traffic.
- Wet roads increase stopping distance, so drivers should slow down and add extra space to compensate for reduced traction.
- With a tailgater, open up more space in front of you so you can brake gradually instead of suddenly. Do not brake to retaliate and do not race away.
- Strong crosswinds can push your car out of its lane. Hold the wheel firmly with both hands, slow down, and be ready for sudden gusts.
- Do not engage. Avoid eye contact, do not brake in retaliation, let them pass, and leave a safe distance between you and that car.
- Horses and livestock spook easily. Slow down, do not honk or rev your engine, and pass very slowly with plenty of room so you do not startle them.
- When you see a hazard developing ahead, cover the brake and plan an escape route so you can react faster if you have to stop.
- In a skid, ease off the gas or brake and steer gently in the direction you want the front of the car to go. Slamming the brakes makes the skid worse.
Road signs
- The octagon shape combined with red coloring is reserved exclusively for stop signs, requiring a full stop.
- Diamond-shaped yellow signs are the standard warning sign shape, alerting drivers to curves, crossings, or other hazards ahead.
- STOP (R1-1): full stop at the line or crosswalk even when empty; yield, then proceed.
- YIELD (R1-2): give up the right-of-way; slow and be ready to stop.
- DO NOT ENTER (R5-1): entry prohibited; common at freeway off-ramps and one-way streets.
- WRONG WAY (R5-1a): you have entered opposing traffic. Pull over safely and turn around when possible.
- ONE WAY (R6-1): all traffic flows in the arrow's direction.
- NO U-TURN (R3-4): no U-turns at this location. This is not a no-left-turn sign (a different arrow shape) or a no-passing sign (a different shape and color entirely).
- NO LEFT TURN (R3-2). A red circle-and-slash always bans the pictured movement.
- NO RIGHT TURN (R3-1): no right turns, including on red. Going straight is still fine since the sign only bans the right-turn movement; parking is unrelated to this sign.
- White/black = regulatory. Speed Limit is the legal max in ideal conditions; drive slower when conditions are bad (Basic Speed Law).
- KEEP RIGHT (R4-7): a median or obstruction is ahead; keep to its right.
- The crossbuck (R15-1) stands at the tracks and legally works like a YIELD sign: slow, look both ways, be ready to stop.
- Advance warning (W10-1): tracks ahead. Slow down, look, and listen.
- School (S1-1): school zone or crossing. Slow down and watch for children; obey the posted reduced school-zone speed limit, which varies by state.
- Pedestrian crossing (W11-2): crossing ahead; slow and be ready to stop.
- Signal ahead (W3-3): an intersection signal is coming, useful when it hides behind a curve.
- Stop ahead (W3-1): a stop sign is coming (often obscured); start slowing now.
- Merge (W4-1): traffic joins ahead. Adjust speed and position to let them in safely.
- Lane ends (W4-2): merge early; zipper-merge when traffic is heavy.
- Two-way traffic (W6-3): you are leaving a one-way road; keep right.
- Divided highway begins (W6-1): directions separate around a median; always keep right of it.
- Slippery when wet (W8-5): slickest in fresh rain. Slow down, keep distance, steer smoothly.
- Curve (W1-2): slow BEFORE the curve; do not brake in the middle of it.
- Turn (W1-1): sharper than a curve; slow down hard, follow the advisory plaque.
- Winding road (W1-5): consecutive curves; hold a steady lower speed throughout.
- Crossroad (W2-1): an intersection ahead with traffic entering from both sides. Hospital signs are blue with an H.
- NO PASSING ZONE (W14-3): unique pennant shape, posted on the LEFT side, marks where passing becomes illegal.
- The octagonal red stop sign universally requires a full stop before the driver may proceed when safe.
- Diamond-shaped yellow signs are standard warning signs alerting drivers to hazards like curves, merges, or crossings ahead.
- White rectangular signs with black lettering are the standard shape and color used for regulatory information like speed limits or turn rules.
- The railroad advance warning sign is round with an X and R R symbol, one of the only circular warning signs used on US roads.
- Orange is the standard color used for temporary construction and work zone signs, regardless of the specific shape used.
- A yield sign requires slowing and yielding to conflicting traffic, stopping only if needed to avoid a hazard.
- A stop sign requires a complete stop, regardless of whether other vehicles or pedestrians are present.
- Pentagon-shaped signs are used specifically to indicate school zones or school crossings, alerting drivers to reduce speed.
- A downward-pointing triangle is the standard yield sign, instructing drivers to slow and give right of way to conflicting traffic.
- The triangular yield sign shape signals drivers to give the right-of-way as needed to other traffic or pedestrians.
- School zone and school crossing signs use a distinctive fluorescent yellow-green pentagon shape to stand out to drivers.
- Diamond-shaped yellow signs are warning signs, alerting drivers to hazards or changes in road conditions ahead.
- Drivers must stop at the marked line or crosswalk, or at the edge of the intersection if there is no marking, before proceeding.
- An inverted triangle is the standard shape used for yield signs, instructing drivers to slow and give way to other traffic.
- The yellow pennant-shaped sign marks the start of a no-passing zone. It usually appears along with a solid yellow line on the pavement.
- A yellow diamond-shaped sign is a WARNING sign, alerting you to a hazard or change ahead such as a curve, intersection, or school, so you slow down.
- A white rectangular sign with black lettering is a REGULATORY sign stating a law you must obey, such as speed or direction of travel.
- An orange sign marks a construction or roadwork zone. Slow down and watch for workers and shifting lanes.
- A blue sign points to driver services such as gas stations, food, lodging, or hospitals.
- A green sign is a GUIDE sign, showing directions, distances, and the names of exits or places.
- A red circle with a slash means the action shown is PROHIBITED, such as no turn or no U-turn at that spot.
Laws and paperwork
- Refusing a breath test is its own violation carrying penalties like fines and IDRC referral, separate from the DUI charge itself.
- Applicants must answer at least 40 of 50 questions correctly, an 80% passing score, per the NJ Driver Manual.
- New Jersey applies the same total cell phone ban to school bus drivers as it does to GDL holders.
- N.J.S.A. 39:4-66.2 specifically makes it illegal to drive across private property to bypass a traffic signal or stop sign.
- New Jersey law requires headlights whenever natural light is insufficient, including sunset to sunrise and low-visibility weather.
- The New Jersey Motor Vehicle Commission (MVC) is the state agency that governs driver licensing in New Jersey.
- New Jersey law prohibits blocking traffic through driving too slowly even under normal road and traffic conditions.
- GDL Option A requires at least six months of practice and a minimum of 50 hours, including 10 hours at night, before the road test.
- GDL Option C requires only 3 months of supervised practice for adults 21+, compared to 6 months/50 hours for younger applicants.
- Permit and probationary holders under 21 may not drive between 11:01 pm and 5:00 am; this restriction does not apply if the holder is 21 or older.
- Per N.J.S.A. 39:3-13 and 39:3-13.4f, two red reflective decals must be displayed, one on the front plate's top left corner and one on the rear plate.
- GDL permit and probationary drivers are barred from using any hand-held or hands-free cell phone or wireless device, stricter than the general adult cell phone law.
- GDL permit holders are limited to a parent/guardian/dependent plus one additional passenger; probationary license holders face the same cap unless a parent/guardian is present.
- A supervising driver for a GDL permit holder must be at least 21, hold a valid NJ driver license, and have a minimum of 3 years of driving experience.
- Accumulating 12 to 14 or more points within 24 months triggers a Notice of Scheduled Suspension; completing a Driver Improvement Program removes 3 points.
- N.J.S.A. 17:29A-35 imposes a $150 surcharge for the first 6 points plus $25 per additional point, billed annually for 3 years regardless of later point reductions.
- Under N.J.A.C. 13:20-17.6, a motorist convicted of 2+ moving violations totaling 4 or more points during this period must enroll in the Probationary Driver Program.
- Per N.J.S.A. 39:5-30.9, completing a defensive driving course removes 2 points, but MVC only recognizes this once every 5 years for point-reduction purposes.
Emergencies
- Per N.J.S.A. 39:4-81, a malfunctioning or dark traffic signal must be treated as an all-way stop.
- New Jersey's Move Over law, in effect since 2009, carries fines ranging from $100 to $500 for violations.
- Pumping the brakes may restore some pressure, and downshifting plus gradual parking brake use helps slow the car safely without locking the wheels.
- Sudden hard braking or sharp steering after a blowout can cause loss of control; easing off the gas while holding a straight line is safer.
- N.J.S.A. 39:4-92.2 requires drivers to change lanes away from the vehicle if safe, or otherwise slow below the posted speed limit; fines run $100-$500.
- Since moose eyes don't glow like deer eyes under headlights, drivers must scan for a large silhouette instead.
- Drivers must move over a lane or slow down when passing any stationary vehicle with flashing lights on the roadside, not just law enforcement vehicles.
- On divided highways of 4+ lanes, drivers should move over a lane away from a stopped emergency vehicle when it can be done safely.
- On typical two-lane roads, traffic in both directions must stop for a loading school bus; the opposite-direction exception applies only on wider divided highways.
- Drivers are expected to keep a substantial following distance after an emergency vehicle passes, rather than closing in immediately.
- Standard practice for emergency vehicle right-of-way is to safely move to the right side of the road and stop to let it pass.
- Drivers must yield to emergency vehicles by pulling over to the right side of the road, clear of intersections, and stopping until the vehicle passes.
- The manual specifies the stop requirement does not apply when a physical median or other barrier separates the two roadways, unlike a simple painted line.
- 23 V.S.A. § 1050(b) requires moving over a full lane if safe, or slowing to a reasonable speed if the driver must remain in the adjacent lane.
- When changing lanes is not safe, the Move Over Law still expects drivers to reduce speed and use caution passing the stopped vehicle.
- Regardless of whether a crossing has gates or signals, drivers must never attempt to beat a visible train and must stop and wait for it to clear.
- Standard guidance for hydroplaning is to ease off the gas and avoid sudden braking or steering, letting the tires regain contact with the road.
- The Move Over Law's amber-light tier covers highway maintenance vehicles, requiring drivers to move over or slow down similarly to emergency vehicles.
- Drivers must yield to emergency vehicles by pulling over to the right and stopping until the vehicle has passed.
- Pumping the brakes can build pressure in some systems, and downshifting uses engine braking to help slow the vehicle safely.
- Authorized emergency vehicles may exceed posted limits during emergency duty with signals operating, as long as they do not endanger others.
- The handbook states drivers must always yield right-of-way to emergency vehicles.
- Drivers are required to stop at the scene of a crash involving injury or significant damage, provide information, and call for assistance if needed.
- Drivers may not park their vehicle within the block where an emergency vehicle has stopped to respond to an incident.
- Drivers must yield the right of way to emergency vehicles by pulling to the right edge of the road and stopping until the emergency vehicle has passed.
- Standard right-of-way and safe-driving practice requires yielding to emergency vehicles by pulling right and stopping until they pass.
- The manual notes you only have right of way if the other vehicle isn't already in the intersection, meaning a vehicle already there should be allowed to clear first.
- If your car catches fire or smells like burning, pull over, shut off the engine, and get everyone away. Do not open the hot hood, since the rush of air will make the fire flare up.
- If the gas pedal sticks, shift to Neutral to cut the power, then brake and steer to the shoulder. Only turn off the engine after you have fully stopped, so you do not lose power steering.
Signs
Sign shape and color carry meaning before you even read the words. A red octagon always means stop, a red-bordered triangle pointing down means yield, and yellow diamonds warn of a hazard ahead. For every sign image used in our practice test, with the exact meaning and explanation, see the full road sign glossary.
Keep studying
This cheat sheet is a summary, not a substitute for practice. Test yourself with the free New Jersey DMV practice test, which explains the reasoning behind every answer, or see New Jersey DMV facts and fees before test day.