Following a Tractor-Trailer on I-95
A rider is westbound on I-95 in the right lane at 65 mph, following a tractor-trailer by about 1.5 seconds. The trailer has mud flaps and a “wide right turn” sticker. A crosswind from the rider’s left is pushing the motorcycle toward the lane line. The rider’s passenger wears a loose half-helmet and keeps turning to look at traffic. The truck’s right rear tire throws a piece of tread into the rider’s path. The rider has room to increase the following distance to 3 seconds, but traffic behind is close. The next exit is 1 mile ahead. The rider wants to pass the truck.
1. Why is 1.5 seconds behind a tractor-trailer unsafe, and what following distance should the rider use?
Read the worked answer
At 65 mph, 1.5 seconds is only about 143 feet. A loaded tractor-trailer can stop much more slowly than a motorcycle in theory, but the real problem is visibility and debris: the rider cannot see far ahead around the trailer, and the truck can throw tread, gravel, or spray into the rider’s path. The truck also creates turbulence and blocks wind, so the rider may be pulled toward it or pushed sideways when the wind shadow changes. A minimum of 3 seconds is better in good conditions, and 4 or more in wind, rain, or poor visibility. The rider should not simply stay close because traffic is behind; the rider should signal, create space, and let the rear traffic adjust. Following too closely removes the time needed to react to the tread and to the truck’s brakes.
2. Describe a safe pass: lane position, visibility, and wind management.
Read the worked answer
Before passing, check mirrors and blind spots, signal, and confirm there is enough clear space in the left lane. Do not linger beside the trailer; the truck’s blind spot is large, and the driver may not see the motorcycle. Accelerate decisively, pass on the left, and maintain a lane position that keeps the rider visible in the truck’s mirror. Expect turbulence and a change in crosswind as the rider moves out of the truck’s wind shadow; use smooth countersteering and avoid abrupt steering. Complete the pass with enough space before returning to the right lane, and do not cut in front of the truck. If traffic or wind makes the pass uncertain, wait rather than ride alongside the trailer.
3. What should the rider do about the passenger and the piece of tread?
Read the worked answer
The passenger is a distraction and a safety problem: a loose half-helmet can shift or come off, and turning to look at traffic moves weight and pulls the rider’s attention. The rider should not try to fix the helmet while moving. The immediate priority is to increase following distance and avoid the tread. A piece of tread should not trigger a panic swerve into another lane; the rider should scan, adjust lane position smoothly if there is room, and brake if needed in a straight line. Then, as soon as it is safe, the rider should pull over and secure the passenger’s helmet and discuss holding still. If the passenger cannot ride safely, the ride should not continue.