- Legal BAC limit in Pennsylvania
- 0.08% for drivers 21+ (0.04% commercial, 0.02% under 21).
- Octagon (red, 8 sides)
- STOP sign — always come to a full stop.
- Downward red triangle
- YIELD sign — slow and give the right-of-way.
- Yellow diamond
- General warning — a curve, hill, merge, or hazard ahead.
- Orange diamond
- Construction or work zone ahead — slow down, watch for workers.
- Pentagon (5 sides)
- School zone or school crossing ahead.
- Round warning sign
- Railroad crossing ahead (usually with 'RR').
- White crossbuck (X)
- At a railroad crossing — has the same meaning as a yield sign; give way to any train.
- Pennant (horizontal triangle)
- No-passing zone — posted on the left side of the road.
- White rectangle sign
- Regulatory sign — a law you must obey (speed limit, one way, lane use).
- Orange triangle with red border
- Slow-moving vehicle emblem — farm equipment or a buggy traveling 25 mph or less.
- Red sign or red on a sign
- Stop, yield, or a prohibition (do not / no).
- Yellow sign
- General warning — caution ahead.
- Orange sign
- Construction and maintenance work zones.
- Green sign
- Guide sign — directions, distances, and route markers.
- Blue sign
- Motorist services — gas, food, lodging, hospitals.
- Brown sign
- Recreation and cultural areas — parks and scenic sites.
- Steady red light
- Stop and stay stopped until green; a right turn on red is allowed after stopping unless prohibited.
- Steady yellow light
- The light is about to turn red — stop if you can do so safely.
- Flashing red light
- Same as a STOP sign: stop, yield, then go when safe.
- Flashing yellow light
- Caution — slow down and proceed carefully.
- Red arrow signal
- No turn in that direction until the arrow turns green.
- Green arrow signal
- You may proceed in the direction of the arrow; the way is protected.
- Dark (unlit) traffic signal
- Treat the intersection as a four-way stop.
- Solid yellow line on your side
- No passing — do not cross it to pass.
- Broken (dashed) yellow line
- Passing is allowed when it is safe.
- Double solid yellow lines
- No passing in either direction.
- Solid white line
- Discourages lane changes — stay in your lane.
- Broken white line
- Lane change is allowed when safe.
- Yellow center two-way left-turn lane
- Shared lane used only for left turns, from either direction.
- White diamond painted in a lane
- A reserved (HOV / carpool or special-use) lane.
- White edge line
- Marks the right edge of the travel lane.
- Reflective raised pavement markers
- Reflectors that mark lanes; reflect your headlights at night to show the road ahead.
- Rumble strips
- Grooved pavement that vibrates to warn you that you are drifting off the lane or shoulder.
- Yellow center line, broken on your side
- You may pass when it is safe; the solid side may not.
- 'Wrong Way' / 'Do Not Enter' sign
- You are about to travel against traffic — do not proceed; back out safely.
- Overhead lane-use arrows
- Show which movements (straight, turn) are allowed from each lane.
- Stop line at an intersection
- The white line where you must stop for a sign or red light.
- Crosswalk lines
- Mark where pedestrians cross; yield and stop for pedestrians in them.
- Shared-lane marking (sharrow)
- Bicyclists may use the full lane; share the lane with them.
- 'No Turn on Red' sign
- Overrides the default — you may not turn right (or left) on the red signal here.
- Regulatory vs warning sign colors
- White/black = regulatory law; yellow = warning; orange = construction.
- Speed limit sign
- A regulatory sign — the maximum legal speed in good conditions (an absolute limit).
- 'Keep Right' sign
- Pass to the right of an obstruction or median ahead.
- Diamond-shaped 'Merge' sign
- Two lanes of traffic are about to join — adjust speed and merge smoothly.
- 'Divided Highway' sign
- A median separates opposing traffic ahead.
- Railroad 'Exempt' sign
- Certain vehicles are not required to stop at this crossing.
- White regulatory 'One Way' sign
- Traffic moves in only one direction; enter only that way.
- Pavement arrow with 'ONLY'
- That lane is for the marked movement only (e.g., left turn only).
- Yellow 'Signal Ahead' sign
- A traffic signal is ahead — be ready to stop.
- Chevron / large arrow sign
- A sharp change in road direction — a curve or turn ahead.
- Default urban / residence speed limit
- 25 mph in a city, town, or residence district unless a sign says otherwise.
- Default speed on most other PA roads
- 35 mph unless posted otherwise.
- Default rural state-route limit
- 55 mph unless a sign posts a different limit.
- Pennsylvania's maximum speed limit
- 70 mph — posted only on certain interstate highways.
- School-zone speed limit
- 15 mph when the school-zone lights are flashing or during the posted time period.
- Basic speed rule
- Always drive at a speed that is reasonable and safe for current conditions, even below the posted limit.
- Right-of-way meaning
- The right to proceed first — something you yield (give), never take.
- Four-way stop, two arrive together
- The driver on the left yields to the driver on the right.
- Four-way stop, first to arrive
- The first vehicle to come to a complete stop has the right-of-way and goes first.
- Turning left at an intersection
- Yield to oncoming traffic going straight before you turn.
- Entering a road from a driveway or alley
- Yield to all traffic already on the road and to pedestrians.
- Uncontrolled T-intersection
- Traffic on the road that ends yields to traffic on the through road.
- Right turn on red in Pennsylvania
- Allowed after a complete stop, unless a 'No Turn on Red' sign is posted, after yielding.
- Left turn on red in Pennsylvania
- Allowed from a one-way street onto another one-way street, after a complete stop, unless prohibited.
- Entering a roundabout / traffic circle
- Yield to traffic already in the circle, then enter to the right when there is a gap.
- Pennsylvania learner's permit age
- 16, after passing the knowledge test, a vision screening, and a physical exam form.
- Supervision required with a learner's permit
- A licensed driver 21+ (or a spouse/parent/guardian 18+) must be in the front seat.
- Supervised hours for a junior license
- At least 65 hours of behind-the-wheel practice before the road test.
- Night hours within the 65 required
- At least 10 of the 65 supervised hours must be at night.
- Bad-weather hours within the 65 required
- At least 5 of the 65 supervised hours must be in inclement (poor) weather.
- Minimum age for a junior license
- 16½, after holding the permit 6 months and completing the 65 hours with no crashes or convictions.
- Junior license driving curfew
- No driving 11:00 p.m. to 5:00 a.m. (limited work, volunteer, and medical exceptions).
- Junior license passengers, first 6 months
- No more than 1 passenger under 18 who is not an immediate family member.
- Junior license passengers after 6 clean months
- Up to 3 passengers under 18 who are not immediate family members.
- Upgrading to a full license
- At 17 with an approved driver's-ed course + 12 months crash/conviction-free, or automatically at 18.
- Points that trigger PennDOT action
- Reaching 6 points triggers a required point exam or driver-improvement school.
- First time reaching 6 points
- Pass a special written point exam (removes 2 points) or attend driver-improvement school.
- Second time reaching 6 points
- A departmental hearing and a possible 15-day license suspension.
- Reaching 6 points after that
- A 30-day license suspension each time.
- Removing points for safe driving
- 3 points are removed for every 12 consecutive months with no violation or suspension.
- Passing the special point exam
- Removes 2 points the first time you reach 6 points.
- Driving 26+ mph over the limit
- Can trigger a departmental hearing and suspension on its own, separate from points.
- Seat belt law, drivers/passengers 18+
- A secondary offense — cited only along with another violation.
- Seat belt law, occupants under 18
- A primary offense — an officer can stop you for it alone.
- Required seat-belt use (under 18)
- Everyone 8 up to 18 must be buckled in every seating position, front or back.
- Yield to an emergency vehicle
- Pull to the right edge of the road and stop until it passes.
- Three-point turn
- A turn-around using forward and reverse to reverse direction on a narrow road when no other option exists.
- Passing on a two-lane road
- Only where the line on your side is broken, with a clear, safe gap, and you can return without crowding.
- Pennsylvania REAL ID
- An optional federally compliant license needed to board domestic flights or enter certain federal facilities.
- Required documents to license
- Proof of identity, Social Security, and Pennsylvania residency when applying.
- Stopping for a stop sign
- Stop fully behind the stop line or crosswalk; if none, stop before entering the intersection.
- Parking on a hill, facing downhill
- Turn your front wheels toward the curb so the car rolls into it if it moves.
- Parking on a hill, facing uphill (with curb)
- Turn your front wheels away from the curb and let the car roll back into it.
- When you may not pass
- On a curve, a hill, at an intersection or crossing, or where a solid line is on your side.
- Yielding to pedestrians
- Drivers must yield and stop for pedestrians in a crosswalk.
- Move into a turn lane
- Signal and enter the proper turn lane well before the intersection.
- U-turn rules
- Make a U-turn only where it is legal, safe, and you can see clearly in both directions.
- Driving in a roundabout
- Keep going counter-clockwise, do not stop inside, and signal before your exit.
- Speed in a work zone
- Obey the posted work-zone limit; fines are often doubled for violations in active work zones.
- Backing up safely
- Check behind the vehicle, back slowly, and never back on a highway or expressway.
- Tiered DUI — general impairment
- BAC 0.08% to 0.099% for drivers 21+ — the standard tier.
- Tiered DUI — high rate of alcohol
- BAC 0.10% to 0.159% — a 12-month suspension and mandatory jail on a first offense.
- Tiered DUI — highest rate of alcohol
- BAC 0.16% and above (or any drug DUI) — the steepest penalties.
- BAC limit for a commercial driver
- 0.04% while operating a commercial vehicle.
- BAC limit for a driver under 21
- 0.02% — Pennsylvania's zero-tolerance limit for minors.
- ARD program
- Accelerated Rehabilitative Disposition — a first-offense DUI diversion program that can shorten the suspension.
- Implied consent law
- By driving in PA you agree to chemical testing if arrested for DUI; refusing means an automatic 1-year suspension.
- Refusing a chemical test (first refusal)
- An automatic 1-year license suspension, separate from any DUI penalty.
- Four-second following rule
- Stay at least 4 seconds behind the vehicle ahead; add more time in rain, snow, or behind a motorcycle.
- How to check following distance
- Watch the car ahead pass a fixed point, then count 'one-thousand-one' to 'one-thousand-four.'
- Paul Miller's Law
- Pennsylvania's handheld-device ban (2025) — holding or using a phone while driving is a primary offense.
- Texting while driving in PA
- Prohibited as a primary offense, including when stopped in traffic or at a red light.
- 'Wipers on, lights on' rule
- Headlights must be on whenever your wipers run continuously for weather — a primary offense.
- When PA requires headlights
- From sunset to sunrise, in weather needing wipers, and when you can't see 1,000 feet ahead.
- Dim high beams for oncoming traffic
- Switch to low beams within 500 feet of an oncoming vehicle.
- Dim high beams when following
- Switch to low beams within 300 feet behind another vehicle.
- High beams in fog or snow
- Use low beams — high beams reflect off precipitation and reduce your own visibility.
- Defensive driving
- Anticipating hazards, keeping space and an escape path, and staying ready to react.
- Scanning the road
- Glance well down the road, then to the sides and mirrors, to spot hazards early.
- Hydroplaning
- Tires ride on a film of water and lose grip; ease off the gas and steer straight to recover.
- Skidding recovery
- Ease off the gas, look and steer where you want to go, and avoid slamming the brakes.
- Driving downhill on a long grade
- Shift to a lower gear and use engine braking so your brakes don't overheat and fade.
- Merging onto a freeway
- Match the speed of traffic on the on-ramp and merge into a safe gap.
- Two-second blind-spot check
- Glance over your shoulder before changing lanes — mirrors don't show the blind spot.
- Signaling a lane change
- Signal several seconds before moving so other drivers can react.
- Stopping distance components
- Perception distance + reaction distance + braking distance.
- Driving in fog
- Slow down, use low beams, and increase your following distance; pull off safely if it's too thick.
- Night driving
- Reduce speed, increase following distance, and never overdrive your headlights.
- Drowsy driving
- As dangerous as drunk driving — pull over and rest; coffee and open windows are not real fixes.
- Aggressive driving
- Tailgating, weaving, and speeding; back off and let an aggressive driver go.
- Tailgated by another driver
- Stay calm, keep a steady speed, and let them pass — don't brake-check.
- Driving in heavy rain
- Slow down, increase following distance, and turn on headlights; watch for hydroplaning.
- Driving on ice or snow
- Slow way down, brake gently, and leave 3+ times the normal following distance.
- Sun glare
- Lower your visor, use sunglasses, and slow down; clean the windshield to cut glare.
- Brake failure
- Pump the brakes, downshift, use the parking brake gradually, and steer to a safe stop.
- Tire blowout
- Grip the wheel, ease off the gas, keep straight, and coast to a stop off the road.
- Stopped at a railroad crossing
- Wait until the lights stop and the gates rise; never cross until you can fully clear the tracks.
- Why leave extra space behind a motorcycle
- Motorcycles can stop much more quickly, so you need more room to react.
- Avoid 'covering' the brake
- Don't rest your foot on the brake — it tires your leg and confuses drivers behind you.
- Space cushion
- Open space around your vehicle that gives you time and room to react to hazards.
- Two-way left-turn lane
- Use the center lane marked with yellow lines only to turn left, from either direction.
- Avoid driving in a cluster of cars
- Stay out of packs so you have an escape path if traffic suddenly stops.
- Following a snowplow
- Stay well back, never pass on the side it's plowing, and expect reduced visibility.
- Construction work zone
- Expect lane shifts and stops, obey flaggers, and slow down — workers may be close to traffic.
- Flagger's instructions
- Override signs and signals; follow the flagger's directions in a work zone.
- Curve at night on an unfamiliar road
- Slow down before the curve and stay within your lane and headlight range.
- Crosswinds past large trucks
- Grip the wheel firmly and be ready for a push as you pass or are passed.
- Strong sun-glare washout
- Slow down and increase distance until you can see clearly again.
- Highway hypnosis / fatigue
- Take breaks, keep your eyes moving, and pull over if you feel drowsy.
- Brake lightly to warn drivers behind
- Tap the brake a few times to alert following traffic before slowing or stopping.
- Vehicle drifting between lanes ahead
- Keep back and pass with caution — the driver may be impaired or distracted.
- One-lane bridge / narrow passage
- Yield to the vehicle that arrives first, or as posted, and wait for a clear gap.
- Lane ending due to a merge ahead
- Signal, match speed, and merge early into the open lane — don't wait until the lane ends.
- Drive to the right in your lane
- Avoid riding next to other vehicles so you keep an open space beside you.
- Stop-and-go traffic gap
- Leave enough room to see the rear tires of the car ahead touching the pavement.
- Be cautious in the first rain
- Roads are most slippery when light rain mixes with oil before it washes away.
- Locked-up brakes (no ABS)
- Ease off and re-apply to keep steering; with ABS, hold firm and steer.
- Overdriving your headlights
- Driving so fast you can't stop within the distance your lights reveal — avoid it at night.
- Carbon monoxide / drowsiness
- Keep good ventilation; never run the engine in a closed space.
- Steer Clear / Move Over Law
- Move one lane away from a stopped emergency response area, or slow to 20 mph below the limit if you can't.
- Emergency response area
- A stopped police, fire, ambulance, tow, or maintenance vehicle, or one showing hazard lights or flares.
- Penalty for ignoring Steer Clear
- Points and fines; causing injury or death to a responder carries far heavier penalties.
- Approaching a stopped school bus
- Stop at least 10 feet away when its red lights flash and the stop arm is out — both directions.
- Exception to the school-bus stop
- Only on the opposite side of a divided highway separated by a physical median.
- Penalty for passing a stopped school bus
- A 60-day license suspension, 5 points, and a $250 fine in Pennsylvania.
- Child under 2
- Must ride in a rear-facing car seat until they outgrow its height/weight limits.
- Child under 4
- Must be secured in an approved child safety seat, in any seating position.
- Child age 4 up to 8
- Must ride in an approved booster seat.
- Occupant age 8 up to 18
- Must wear a seat belt in every seating position.
- Sharing the road with bicyclists
- Pass with at least 4 feet of space and treat them as a vehicle.
- Slow-moving vehicle (farm equipment/buggy)
- Marked by an orange triangle; travels 25 mph or less — slow early and pass only when safe.
- Sharing the road with motorcyclists
- Allow extra following distance and check blind spots — motorcycles are easy to miss.
- Large truck making a wide right turn
- It may swing left first; never try to squeeze up its right side.
- Emergency vehicle approaching from behind
- Pull to the right edge and stop until it passes; don't follow it closely.
- Funeral procession
- Yield to the procession and don't cut into it; vehicles in it may proceed together.
- Pedestrian at an unmarked crosswalk
- Yield to pedestrians crossing at intersections even where lines aren't painted.
- Ice cream truck / children present
- Slow down and watch for children who may dart into the street.
- Police officer directing traffic
- Always obey the officer, even over signs and signals.
- Passing a bicyclist near oncoming traffic
- Wait until you have a safe gap and at least 4 feet of space before passing.
- Tow truck stopped with amber lights
- Move over a lane or slow down — it's covered by the Steer Clear law.
- Strong wind gust passing a truck
- Grip the wheel firmly and be ready for a side push.
- Long freight train at a crossing
- Wait until the gates rise and the lights stop; never go around lowered gates.
- Double-parked delivery truck
- Check oncoming traffic, signal, and go around only when the lane beside you is clear.
- Motorcyclist signaling a left turn
- Give space and don't pass on the left until they complete the turn.
- Loaded logging/heavy truck climbing a grade
- It moves slowly uphill — be patient and pass only with a clear, legal gap.
- Child on a bicycle ahead
- Slow down, give wide space, and expect sudden moves.
- Electric scooter / micromobility rider
- Treat them as vulnerable road users; pass with care and extra space.
- Horseback rider on a narrow road
- Slow down, pass wide and quietly, and avoid startling the horse.
- Vehicle ahead with hazard lights
- Slow down — it may be stopped or moving slowly; pass only when safe.
- Bicyclist's left-arm-straight-out signal
- Means a left turn; give space and yield as needed.
- Bicyclist's left-arm-up (bent) signal
- Means a right turn.
- Flaggers and workers in a work zone
- Slow down, obey the flagger, and be ready to stop.
- Emergency vehicle while you're in an intersection
- Clear the intersection first, then pull right and stop.
- Postal/delivery vehicle making frequent stops
- Expect it to stop often; keep back and pass only when clear.
- Meeting a buggy at night on a rural road
- Dim your high beams and slow down — buggies have limited lighting.
- Tractor towing equipment on a country road
- Slow down well in advance and pass only when you can see far ahead and it's legal.
- Pedestrian with a white cane or guide dog
- Always yield — they have the right-of-way; stop and let them cross.
- Stopped on a multilane road for a school bus
- All lanes in both directions stop, unless divided by a physical median.
- Roundabout with a large truck ahead
- Give it room — it may need more than one lane to navigate the circle.