Pennsylvania Following-Distance & Headlight Rules
How far back to follow another vehicle, when to dim high beams for oncoming and following traffic, and the move-over law for emergency vehicles.
- Following-distance rule
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Pennsylvania uses a 4-second following distance on dry highways. To check it, watch the rear bumper of the vehicle ahead pass a road marking or roadside object such as a telephone pole, then count the seconds until your front bumper reaches the same spot; if you arrive in less than four seconds, you are too close. Increase the gap when roads are wet, slippery, or unpaved (5 to 6 seconds), when following a vehicle whose rear view is blocked, when following large vehicles or vehicles pulling trailers, when approaching slow-moving vehicles or bicycles, when following school buses, taxis, transit buses, or hazmat trucks, when driving downhill, or when stopped on an uphill. On packed snow, cut your speed in half; on ice, slow to a crawl and leave about ten times the normal gap.
Source: Pennsylvania Driver's Manual (PUB 95), Chapter 3: Managing Space (4-Second Rule)
- Dim high beams within (ft) — oncoming
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500
Source: Pennsylvania Driver's Manual (PUB 95), Chapter 3: Driving at Night
- Dim high beams within (ft) — following
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300
Source: Pennsylvania Driver's Manual (PUB 95), Chapter 3: Driving at Night
- Headlight requirements
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Pennsylvania law requires drivers to use their headlights between sunset and sunrise; when insufficient light or heavy traffic makes the vehicle hard to see; whenever rain, snow, sleet, hail, fog, smoke, or smog reduces visibility; when pedestrians or vehicles cannot be seen for at least 1,000 feet ahead; when driving through work zones; and whenever windshield wipers are in continuous or intermittent use due to weather. Daytime running lights alone do not satisfy the requirement; tail lights must also be illuminated. The fine begins at $25 and approaches $100 with fees. Pennsylvania's separate Headlight/Windshield Wiper Law (effective January 28, 2007) reinforces the wipers-on, lights-on rule. In a posted work zone, an additional $25 penalty applies for failure to use headlights, whether the zone is active or not. High beams must be dimmed within 500 feet of an oncoming vehicle and within 300 feet of a vehicle you are following.
Source: Pennsylvania Driver's Manual (PUB 95), Chapter 3: Driving at Night / Headlight/Windshield Wiper Law
- Min following distance behind emergency vehicle (ft)
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500
Source: Pennsylvania Driver's Manual (PUB 95), Chapter 3: Emergency Vehicles and Situations
- Motorcycle following rule
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Leave three or four seconds when following a motorcycle, so the motorcyclist has enough time to maneuver or stop in an emergency. In dry conditions a motorcycle can stop more quickly than a car, and motorcyclists may change speed or lane position suddenly to react to potholes, gravel, wet or slippery surfaces, pavement seams, railroad crossings, or grooved pavement. Increase the following distance further when road or weather conditions are poor. Allow a motorcycle a full lane width and never share the lane.
- Cyclist safe-passing rule
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Pennsylvania law requires drivers to allow at least four feet between the vehicle and a bicycle when passing. Before passing, check for oncoming traffic and decide whether you can maneuver around the bicyclist; if necessary and safe, you are permitted to cross the center double yellow line to maintain that four feet of clearance. Drivers may not turn into the path of a bicyclist riding straight ahead on a roadway or shoulder, may not force a bicyclist off the road (criminal charges may apply), and must reduce speed before passing. Bicyclists may use any portion of a single travel lane to avoid hazards or keep safe distance from parked cars.
Source: Pennsylvania Driver's Manual (PUB 95), Chapter 5: Safe Passing is the Law
- Move-over law (stopped emergency vehicles)
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Pennsylvania's Move Over Law requires drivers to move into a lane that is not adjacent to an emergency response area or a disabled vehicle. An emergency response area is any area on or near a road where police, sheriffs, coroners, medical examiners, firefighters, fire police, fire marshals, rescue personnel, EMS, towing and recovery personnel, hazmat responders, or highway construction and maintenance personnel are providing services. A disabled vehicle is one in or beside a traffic lane that is clearly marked with at least two signal lamps, road flares, caution signs, or other traffic control devices. If traffic or other conditions prevent moving over, the driver must reduce speed to at least 20 mph below the posted speed limit. Workers and emergency responders may report violators directly to law enforcement, who may issue citations from those reports. Penalties for failure to move over or slow down are a fine up to $500 for a first offense, $1,000 for a second, and $2,000 for a third or subsequent, plus 2 points on the driving record and doubled fines in work zones. If the violation causes serious bodily injury or death to another person, a 90-day license suspension and fine up to $1,000 apply; serious bodily injury to a responder or person in or near a disabled vehicle triggers a 6-month suspension and fine up to $5,000; a fatality involving a responder or person in or near a disabled vehicle triggers a 1-year suspension and fine up to $10,000.
Source: Pennsylvania Driver's Manual (PUB 95), Chapter 3: Move Over Law
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