Space Management and Speed Control
The Core Idea
Space management questions test whether you maintain safe following distance, manage speed, and leave yourself an out.
Concepts You Must Know
- Following distance: one second per 10 feet of length, plus one second above 40 mph.
- Space cushions: leave room ahead, beside, and behind; avoid traveling in packs.
- Speed control: adjust for weather, road conditions, and load. Slow down in rain, fog, and on curves.
- Passing: ensure you have enough room and time; never pass on hills or curves where visibility is limited.
- Hills: downshift before the grade; use engine braking.
Traps to Watch
Questions often swap the 40 mph threshold or the one second per 10 feet rule. Another trap is assuming you can stop as quickly as a car - you cannot.
Worked Example
A 70-foot combination at 55 mph needs 7 seconds (one per 10 feet) plus 1 second for being above 40 mph = 8 seconds of following distance.