Right Turn With a Car in the Blind Spot
At 3:30 p.m., a 75-foot tractor-trailer is delivering to a downtown store. The driver must turn right from a two-lane street onto a 24-foot-wide cross street. The curb radius is tight, a utility pole sits 8 feet from the corner, and the trailer's rear axles will off-track about 5 feet inside the turn. The driver brakes, checks the right mirror, and sees a compact car that has moved into the gap on the right. The car's front bumper is even with the middle of the trailer, and the driver cannot see its driver in the mirror. Traffic is behind, the light is green, and a pedestrian is waiting at the corner. The driver has 11 years of experience and usually “swings wide” to clear the curb. The car driver is looking forward and has not seen the trailer's turn signal. The driver must decide whether to continue, stop, or ask the car to back up.
1. How should the driver have set up this right turn, and why does the trailer track inside the tractor's path?
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The driver should approach from the left side of the legal lane, using all available lane width without crossing the centerline, and delay the turn until the tractor's front bumper has cleared the curb line and the trailer wheels are visible in the right mirror. Off-tracking happens because the trailer's rear axles pivot around a point and follow a shorter radius than the tractor's front axle. With a long wheelbase and a 53-foot trailer, the rear tandem can cut 5 feet or more inside the turn. “Swinging wide” to the left helps only if it is done legally and without creating a gap on the right; a wide swing can actually invite a car into the space. The driver should also check both flat and convex mirrors and, if unsure, stop and look.
2. The car is even with the trailer midpoint. Should the driver continue, brake, or wait? What should the driver communicate?
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The driver should not continue. As the tractor completes the turn, the trailer's rear section will pivot toward the curb and into the car. Braking hard may not prevent contact and could jackknife or throw the car's driver into panic; the better choice is a controlled stop before the trailer's path reaches the car, with the wheels straight if possible. The driver should use the horn only if contact is imminent, then hold position. Waving the car through is risky because the driver cannot see the car's driver and may not know the car's clearance. A spotter or a request over the PA to back up may be needed. If the car cannot move, the driver should wait for police or a spotter rather than force the turn. Mirrors have blind spots, and the car may be invisible from the cab.
3. What should the driver do after the turn to confirm the trailer cleared the curb and the car?
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After completing the turn, the driver should stop as soon as it is safe and legal, set the parking brake, and walk back to inspect the trailer tires, curb, pole, and car. The right mirror alone is not enough because the trailer's side and rear are blind at that angle. The driver should check for tire scuffing, bent rims, curb damage, and any contact with the car. If contact occurred, the driver must stop, exchange information, and report it; leaving would be a hit-and-run. If no contact occurred but the curb was struck, the driver should report it and check for damage. The driver should also note the incident and consider a different route next time, because the street's 24-foot width and tight radius are a poor fit for a 75-foot combination.