Space Management
Space Management tests how you create and protect room around a commercial vehicle. The exam focuses on following distance, side and rear space, passing, intersections, blind spots, and escape routes. Space is time-time to see, react, and stop.
Core rules
- Follow at one second per 10 feet of vehicle length at speeds under 40 mph. Above 40 mph, add one second.
- A 60-foot combination at 55 mph needs 7 seconds: 6 seconds for length plus 1 for speed. At 55 mph that is about 565 feet.
- Add more space in rain, snow, fog, darkness, or when following a vehicle that blocks your view.
- Avoid blind spots alongside and behind other vehicles. If you cannot see the driver's mirror, the driver may not see you.
- At intersections, leave space to pull around a vehicle that stalls ahead.
- Pass only with clear road, adequate power, and enough space to return. Do not pass on a curve, hill, or blind spot.
- Keep an escape route to the side or ahead; do not let a tailgater dictate your speed.
Worked example
A 60-foot tractor-trailer travels at 55 mph behind a car. The driver applies the 7-second rule and leaves about 565 feet. Another driver pulls into that gap and slows. Instead of tailgating, the truck driver eases off, rebuilds space, and checks the left mirror for a safe lane change. The gap was not wasted space; it was the stopping and reaction room that prevented a rear-end crash.
Traps
- Using a car's 3-second rule for a long combination vehicle.
- Leaving the same gap in rain as on dry pavement.
- Tailgating to prevent others from cutting in.
- Passing without enough room to return safely.