Seeing Hazards and Space Management
Seeing Hazards and Space Management
This domain tests how far ahead you scan, how you identify hazards, and how much space you keep around the vehicle. The exam favors drivers who create an escape route instead of reacting late.
Core rules
- Scan 12 to 15 seconds ahead in urban areas and farther on open highways. Check mirrors every 5 to 8 seconds and before lane changes, turns, and stops.
- Watch for fixed hazards such as narrow bridges, work zones, and low clearances, and moving hazards such as pedestrians, cyclists, and vehicles entering from side roads. Plan an escape route before you need it.
- Keep a following distance of at least one second for each 10 feet of vehicle length below 40 mph; add one second above 40 mph. A 60-foot combination at 45 mph needs about 7 seconds. Increase space in rain, snow, darkness, or heavy traffic.
- Avoid lingering in blind spots, and do not let other drivers linger in yours. Use lane position to improve visibility and to discourage unsafe passing.
Worked example
A 60-foot truck travels at 45 mph. The base rule gives 6 seconds because the vehicle is 60 feet long. Since 45 mph is above 40 mph, add one second for a 7-second gap. At 45 mph, about 66 feet pass each second, so the gap should be roughly 460 feet. Reasoning: the speed and vehicle length both increase the space needed to see and stop.
Traps that cost marks
Watching only the vehicle directly ahead; forgetting that a loaded truck needs more space; following too closely in rain; and failing to identify an escape route before traffic tightens.