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Most-missed Texas DMV rules
These are the numbers and rules that trip up new drivers most often on the real Texas knowledge test. Every fact below comes from our free Texas DMV practice test question bank, which has 180 questions across 9 topics.
Speed limits
- Texas Transportation Code Sec. 545.352 sets a 30 mph prima facie limit on urban district streets when no other limit is posted.
- State statute sets alleys at 15 mph by default, lower than the 30 mph urban street limit, reflecting the tighter, higher-risk space.
- Flashing lights near a school zone signal that the locally set reduced speed limit is currently active and must be obeyed.
- The basic speed law does not set one fixed statewide numeric limit; instead it requires 'reasonable and prudent' speed for conditions with mandatory reductions near intersections, railroad crossings, curves, and hazards.
- State law caps the default maximum at 70 mph, but authorizes 75, 80, or 85 mph on specific highways engineered and studied to safely support those speeds.
Right of way
- Standard right-of-way rules give priority to the vehicle already in or first to reach the intersection, with ties going to the driver on the right.
- A left-turning driver must wait for a safe gap in oncoming traffic and yield to any pedestrians legally crossing before completing the turn.
- Drivers are required to yield to pedestrians lawfully in a crosswalk, whether or not the crosswalk is marked with painted lines.
- When vehicles arrive simultaneously at a stop-controlled intersection, the vehicle to the right is given the right of way.
- Texas law requires drivers to yield right of way by pulling to the right and stopping until the emergency vehicle passes.
- 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
- The adult per se BAC limit is 0.08%, and any BAC at or above that level while driving triggers Administrative License Revocation (ALR).
- Texas Transportation Code 521.342 imposes an automatic suspension for any detectable amount of alcohol in a driver under 21, regardless of BAC level.
- A minor convicted of DWI receives a one-year suspension; a subsequent alcohol-related offense can result in an 18-month suspension.
- Suspension lengths escalate as 30 days for a first offense, 60 days for a second, and 180 days for a third.
- A first-offense DWI Class B Misdemeanor carries a fine up to $2,000, 72 hours to 180 days confinement, and a 90-day to 1-year license suspension; a court may waive the suspension only on a first offense.
Signals and markings
- A solid yellow line facing your direction of travel indicates passing is not allowed from your side of the roadway.
- A dashed yellow line means passing is allowed when there is a safe gap in oncoming traffic, unlike a solid yellow line.
- A flashing red signal is legally equivalent to a stop sign: the driver must come to a full stop before proceeding when clear.
- A flashing yellow signal warns drivers to slow down and proceed carefully, rather than requiring a full stop.
- White lines separate same-direction lanes of travel, while yellow lines are used to separate opposing directions of traffic.
- A flashing red signal functions like a stop sign, requiring drivers to come to a complete stop before proceeding when it is safe.
- A flashing yellow signal warns drivers to slow down and proceed carefully, unlike a solid red which requires a full stop.
- A green arrow grants a protected right of way to complete that turn without yielding to opposing traffic.
- A steady red signal requires a full stop; any right turn on red is only allowed after stopping and when safe and not prohibited by signage.
- A flashing yellow signal warns drivers to proceed through the intersection with caution rather than requiring a full stop.
- A law enforcement officer's directions override traffic signals, so drivers must obey the officer even if it means stopping on a green light.
- A green arrow gives the protected right-of-way to proceed in that direction, though the driver must still yield to anyone already in the intersection.
- A driver turning left must yield the right-of-way to all oncoming traffic, including bicyclists, before completing the turn.
- Broken white lines between same-direction lanes indicate that changing lanes is allowed when it can be done safely.
- The manual requires dimming high beams for oncoming traffic to avoid blinding other drivers.
- 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 broken yellow line on your side permits passing when safe, while a solid yellow line on your side prohibits passing, a standard center-line marking convention drivers must recognize.
- The handbook notes posted limits are for ideal conditions, so hazards like hills and curves require a driver to slow below the sign's number.
- A steady red light always requires a complete stop before the intersection unless a sign specifically permits turning after stopping.
- A solid yellow line on your side of the center marking indicates passing is prohibited from that direction due to limited sight distance or other hazards.
- A dashed yellow center line indicates passing is generally permitted when it can be done safely, unlike a solid yellow line.
- A steady red light requires a full stop; cross traffic has the right of way until the light changes.
- 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 within 15 feet of a fire hydrant is prohibited so emergency crews can access it quickly without obstruction.
- Vehicles should be parked close to the road edge, generally within about 18 inches, to leave room for through traffic.
- Blocking a driveway is prohibited because it can trap a vehicle inside or prevent emergency access, regardless of how long the stop is.
Safe driving
- A minimum three-second following gap gives most drivers enough time to react and stop safely under normal conditions.
- Wet roads increase stopping distance, so drivers should slow down and add extra space to compensate for reduced traction.
- Hydroplaning occurs when water builds up faster than tire tread can channel it away, causing the tires to ride on water and lose grip.
- Sudden braking or sharp steering after a blowout can cause loss of control; easing off the gas while steering straight is safer.
- Fatigue slows reaction time and judgment similarly to impairment, and can lead to microsleeps that cause the driver to lose control.
- Headlights are required not just at night but any time low visibility conditions, like rain or fog, make it hard to see other vehicles.
- Learner license holders must have a licensed adult 21 or older in the front passenger seat at all times and cannot use a cell phone, including hands-free, except in an emergency.
- Provisional license holders may not have more than one passenger under age 21 in the vehicle who is not a family member.
- All wireless communication device use, including hands-free devices, is prohibited for provisional license holders while driving except in an emergency.
- The Basic Speed Rule obligates drivers to reduce speed below the posted maximum in hazardous conditions.
- Work zones require reduced speed and heightened alertness because of workers, equipment, and changing lane patterns.
- Advisory speed plates on curve warning signs indicate a safe reduced speed that drivers should slow to before entering the curve.
- Endangering a highway worker with no injury results in a fine of $500 to $1,000, rising to as much as $5,000 if great bodily injury results.
- The manual stresses that no one should ever assume they automatically have the right of way, since other drivers may not yield as expected.
- Scanning further ahead gives drivers earlier warning of hazards, slowing traffic, or obstacles, allowing more time to react safely.
- Since farm tractors typically travel around 25 mph, the speed differential requires extra caution and clearance when passing.
- Since entering roundabout traffic must yield to vehicles already circulating, slowing down and watching for a safe gap is the correct approach.
- A several-second following distance, often cited as at least 3 seconds under normal conditions, provides reaction time to avoid rear-end collisions.
- Safe lane changes require checking mirrors, checking blind spots by looking over the shoulder, and signaling the intended move before moving over.
- The manual teaches drivers not to swerve for animals, since swerving often causes worse crashes than a controlled collision or straight-line braking.
- Drivers must yield to emergency vehicles with active lights and siren by safely moving aside, not stopping in the travel lane.
- An owner cited by a stop-arm camera faces monetary penalties instead of points: $250 for a first violation, rising to $300 for a third within 18 months.
- Rural highways through unfenced farm and ranch land require extra alertness for livestock and wildlife crossing the road.
- Drivers must stop for a school bus with flashing red lights and remain stopped until the lights stop flashing, protecting children crossing.
- A minimum 3-second following distance gives drivers enough time to react to sudden braking by the vehicle ahead.
- Because posted speed limits assume ideal conditions, the handbook advises reducing speed in rain and other hazardous conditions.
- Posted speed limits are for ideal conditions; drivers should reduce speed further and increase following distance in poor weather like heavy rain or fog.
- 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.
- Passengers under 2 years old must specifically be secured in a rear-facing child restraint system.
- The manual requires yielding to pedestrians, cyclists, and others still clearing the intersection even if you'd otherwise have priority.
- 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 five-sided pentagon shape is reserved specifically for school-related warning signs, distinct from all other warning sign shapes.
- 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.
- The triangular shape is uniquely reserved for Yield signs, telling drivers to slow and give way rather than come to a full stop.
- The eight-sided octagon shape is reserved exclusively for Stop signs so it can be recognized even from behind or in poor visibility.
- Diamond-shaped yellow signs are the standard warning sign shape, alerting drivers to curves, crossings, or other hazards ahead.
- A stop sign requires a complete stop, regardless of whether other vehicles or pedestrians are present.
- 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 eight-sided red STOP sign requires a full stop before entering the intersection, regardless of visible cross traffic.
- At a yield sign, drivers must slow or stop as needed to let crossing or oncoming traffic clear before proceeding safely.
- Diamond-shaped yellow signs are warning signs, alerting drivers to hazards or changes in road conditions ahead.
- Diamond-shaped yellow signs are standard warning signs alerting drivers to hazards ahead, such as curves, merges, or intersections.
- A circular sign with a diagonal slash through it is used nationally to show that a prior restriction (like a speed limit) no longer applies.
- The eight-sided shape is reserved exclusively for stop signs so drivers can recognize it even if the sign face is obscured.
- White rectangular signs with black lettering are the standard shape and color used for regulatory information like speed limits or turn rules.
- The eight-sided red STOP sign requires a complete stop at the marked line or intersection before proceeding when safe.
- Warning signs (typically yellow, diamond shaped) inform drivers of hazards ahead like curves or crossings, distinct from regulatory signs that state legal requirements.
- The five-sided pentagon shape is used nationally to indicate school zones and school crossing warnings.
- The manual specifies reduced speed limits apply at locations marked with a School Crossing sign when children are present.
- The handbook instructs drivers at yield signs to slow down and yield to vehicles already in the intersection or approaching.
- The downward-pointing red-and-white triangle is the standard YIELD sign, requiring drivers to slow and yield to conflicting traffic.
- Yellow diamond signs are standard warning signs alerting drivers to hazards or changing road conditions ahead.
- 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
- ALR is a civil process that can suspend a license after a DWI arrest independent of whether the criminal case results in conviction.
- Minors in Texas follow a Graduated Driver License system, including a signed acknowledgment about the Zero Tolerance alcohol law.
- Texas requires drivers to carry proof of financial responsibility, typically liability insurance, and driving without it carries fines and penalties.
- By driving in Texas, motorists are considered to have consented to chemical testing if lawfully arrested on suspicion of DWI.
- The GDL program has two phases: Phase 1 is the Learner License and Phase 2 is the Provisional License.
- A Texas learner license can be issued to applicants between 15 and 17 years of age.
- Provisional license applicants must be 16 or 17 years old and must have held a learner license (or minor restricted driver license) for at least 6 months.
- Provisional license holders may not drive between midnight and 5:00 a.m. unless the trip is necessary for work, a school-related activity, or a medical emergency.
- A minor restricted (hardship) driver license can be issued as young as age 15, waiving the normal 6-month learner-license holding requirement.
- The GDL program's phase restrictions do not apply to motorcycle licenses.
- A driver has only 15 days after being served the ALR suspension notice to request a hearing to contest the suspension or disqualification.
Emergencies
- Pumping the brakes can rebuild some pressure, and downshifting uses engine braking to help slow the vehicle safely before using the parking brake carefully.
- The priority is to stop safely away from traffic, shut off the engine, and move away from the vehicle before dealing with the fire.
- Drivers should move to safety if the vehicles are drivable, then exchange license, insurance, and contact information as required.
- The Move Over law requires drivers to vacate the nearest lane, or if unable on a single-lane roadway, slow to 20 mph below the posted speed limit.
- Penalties escalate from a Class C misdemeanor ($200-$500) to Class B (property damage, up to $2,000/180 days) to Class A (serious bodily injury to emergency worker, up to $4,000/1 year).
- Drivers are expected to keep a substantial following distance after an emergency vehicle passes, rather than closing in immediately.
- Drivers must yield to emergency vehicles by pulling over and stopping, clearing the intersection first if already inside it.
- Drivers must yield to emergency vehicles by pulling over to the right and stopping until the vehicle has passed.
- 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.
- The manual notes that if you're already in an intersection when an emergency vehicle approaches, you should proceed through it first before pulling over to stop.
- On divided highways of 4+ lanes, drivers should move over a lane away from a stopped emergency vehicle when it can be done safely.
- Pumping the brakes can build pressure in some systems, and downshifting uses engine braking to help slow the vehicle safely.
- The Move Over Law's amber-light tier covers highway maintenance vehicles, requiring drivers to move over or slow down similarly to emergency vehicles.
- Standard practice is to safely move to the right and stop, clearing the path for the emergency vehicle to pass.
- Move Over laws require drivers to move over or slow down for any stopped vehicle with warning lights activated, to protect people near the roadway.
- Per N.J.S.A. 39:4-81, a malfunctioning or dark traffic signal must be treated as an all-way stop.
- Drivers may not park their vehicle within the block where an emergency vehicle has stopped to respond to an incident.
- Standard guidance for hydroplaning is to ease off the gas and avoid sudden braking or steering, letting the tires regain contact with the road.
- Drivers must yield right-of-way, pull as far right as possible, stop, and remain stopped until the emergency vehicle has passed.
- Drivers should move to the right and yield the roadway to approaching emergency vehicles with active lights and sirens, stopping if necessary to let them pass safely.
- 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.
- 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.
- Since moose eyes don't glow like deer eyes under headlights, drivers must scan for a large silhouette instead.
- 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 Texas DMV practice test, which explains the reasoning behind every answer, or see Texas DMV facts and fees before test day.