Shifting, Backing, and Turning
This domain covers progressive shifting, safe backing, and turning geometry for long wheelbases. Minnesota's general knowledge exam asks how to shift without damaging the drivetrain, how to back with limited visibility, and how to prevent off-tracking from hitting a curb or vehicle.
Shifting
Use progressive shifting: upshift at the lowest rpm that keeps the engine in its power band. Do not lug the engine or over-rev. With a non-synchronized transmission, double clutch: clutch in, neutral, clutch out, clutch in, next gear. Shift before a curve or railroad crossing, not while on it.
Backing
Avoid backing when possible. If you must back, get out and check the area first, use a spotter, and back slowly toward the driver's side. Use both mirrors and four-way flashers. If you lose sight of the spotter, stop.
Turning
Right turns require setup: keep the rear wheels close to the curb and turn wide as the front clears, because the rear wheels track inside the front path. Left turns should begin from the proper lane, not by swinging into oncoming traffic.
Worked example
A 53-foot trailer turns right from a two-lane road into a narrow street. The driver first moves to the left side of the lane, checks the right mirror, and delays the turn until the trailer's rear wheels pass the curb. Reasoning: the trailer off-tracks several feet inside the tractor path; turning early would put the rear wheels over the curb.
Traps that cost marks
Turning too soon and clipping the curb; backing with mirrors only and no spotter; skipping gears on a downgrade; shifting while crossing tracks.