On-Road Driving: Managing Space, Speed, and Grades
The On-Road Driving domain is the street and highway portion of the skills test. It scores lane position, turns, lane changes, merging, speed selection, downgrade control, railroad crossings, and how you share space with smaller vehicles.
Turns and lane position
Swing wide enough to keep trailer tires out of the curb lane without crossing into oncoming traffic, and check the mirror for tail swing at the tractor's front corner. Slow before entering a turn and accelerate gently through it.
Grades and curves
- Select a lower gear before the crest of a downgrade, not after speed builds.
- Use engine braking and snub braking (firm applications, then release) to avoid brake fade.
- Slow before a curve; a top-heavy combination rolls over from speed carried into the turn.
Railroad crossings and bridges
Never shift while crossing the tracks, and do not start across unless you can clear the far side completely. Check posted height and weight limits before any bridge.
Space management
One second per 10 feet of vehicle length below 40 mph, plus one second above 40 mph. Signal early, check mirrors and blind spots, and hold your lane and speed when being passed.
Worked example
A 65-foot rig at 55 mph needs 6.5 seconds for length plus 1 second for speed, or 7.5 seconds. At roughly 80 feet per second, that is about 600 feet of following distance - long enough that a car merging into the gap is expected, not a surprise.
Traps that cost marks
Braking hard into a curve; downshifting after the grade has already raised your speed; stopping on the tracks because traffic ahead is backed up; cutting corners on right turns; tailgating at highway speed.