If you are driving on a highway next to a single broken white line marking:
- You cannot cross the line to pass.
- You may cross the line to pass and change lanes. ✓
- You may only cross the line to change lanes if you are in the left lane.
Answer: B. You may cross the line to pass and change lanes.
A single broken white line may be crossed to pass another vehicle and to change lanes.
Why this is the answer
The handbook says broken white lines separate traffic lanes on roads with two or more lanes going the same direction. It also says never change lanes over double solid white lines and to wait until you see a single broken white line. That contrast makes the single broken white line the marking where crossing between same-direction lanes is allowed, whether you are changing lanes or passing.
Why the other answers are wrong
- A. You cannot cross the line to pass. — A single broken white line is not a barrier; the handbook uses double solid white lines as the marking you must never cross for a lane change.
- C. You may only cross the line to change lanes if you are in the left lane. — The handbook does not make crossing a broken white line depend on being in the left lane; broken white lines separate same-direction traffic lanes.
Remember it
Broken white means the lane line is open for a lane change; double solid white means stay put.
Official handbook: California Driver Handbook (DL 600), Section 6: Navigating the Roads, p. 14