Tractor-Trailer Swing and a Cyclist on the Shoulder
You are eastbound at 45 mph in the right lane of a four-lane road, two lanes in each direction, following a tractor-trailer. The truck's right-turn signal comes on for a driveway ahead. As it slows, the truck moves left and its cab crosses the center line; the trailer's rear wheels are still in your lane. A cyclist in a bright jacket is riding on the right shoulder about 40 feet ahead of the truck's intended path. You are late for an appointment, and the left lane is open behind you. Your following distance is about two seconds. The truck slows to 15 mph and swings wider. What do you do?
1. Why is the truck moving left before a right turn, and should you pass on the right?
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A large truck needs extra room because its rear wheels track inside the cab's path. If it turned tightly from the right lane, the trailer could crush the curb, a sign, or a cyclist. The left swing is a normal setup for a wide right turn. You should not pass on the right. Passing there puts you in the space the trailer will sweep through as it completes the turn, and it also crowds the cyclist. The correct choice is to hang back, let the truck finish the turn, and pass only on the left when the lane is clear and legal. Being late does not justify entering a closing gap.
2. What following distance should you keep, and what should you do about the cyclist?
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Two seconds is too close, especially behind a turning truck. In good conditions, aim for at least four seconds; at 45 mph, that is roughly 264 feet. Increase it because the truck is slowing and may stop across your lane. The cyclist is a road user with the same rights; do not squeeze past or honk. If the truck blocks the lane, stop behind it rather than swinging into the shoulder or bike lane. Before any left-lane pass, check mirrors and blind spots and leave at least three feet when passing a cyclist if you later encounter one.
3. The truck stops with its trailer blocking your lane and the driveway is still 30 feet ahead. What is the safest response?
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Wait behind the truck at a safe distance and do not try to drive around its right side. The driver may be waiting for a pedestrian, a cyclist, or a car to clear the driveway, or may need to back up. If the left lane is clear and passing is legal, you may pass on the left after checking that the truck will not swing further left. Do not use the shoulder. If the truck begins backing, stay well clear and sound your horn only if needed to warn. Patience is the correct call because the trailer's path is unpredictable.