To enter a gap in highway traffic:

  1. Watch only the vehicles behind the gap.
  2. Check behind you, then watch the vehicle ahead. ✓
  3. Speed up and let the other vehicles make way.

Answer: B. Check behind you, then watch the vehicle ahead.

Check behind you first, then keep watching the vehicle ahead as you enter the gap.

Why this is the answer

The handbook says to check your blind spots before you merge with traffic, and to look over your shoulders without turning the wheel. It also says that when entering traffic you must proceed with caution and yield to vehicles already in the lanes. That supports checking behind you first, then keeping watch on the vehicle ahead as you join the gap. The passages do not give a separate highway-gap procedure, so this is a careful reading rather than a direct statement.

Why the other answers are wrong

Remember it

Check your shoulder before merging, then keep your eyes on the car ahead.

Official handbook: California Driver Handbook (DL 600), Section 8: Safe Driving, p. 58

Explanation drafted with AI (deepseek-flash) from the official handbook passage cited above, then checked automatically and by a second model on 2026-10-23. Always confirm with the official handbook.