You may drive across a dashed white line:
- At any time.
- Only during daylight hours.
- When it is safe to change lanes. ✓
- Only when passing a motorcycle.
Answer: C. When it is safe to change lanes.
You may drive across a dashed white line when it is safe to change lanes.
Why this is the answer
The handbook describes a single broken white line as a divider between lanes of traffic going the same direction. It says you may cross that line to change lanes when it is safe to do so. So the line itself is not a ban, and it is not a free pass either — the condition attached to crossing it is that the lane change can be made safely.
Why the other answers are wrong
- A. At any time. — Crossing is not open at any time, because the handbook ties it to doing so safely.
- B. Only during daylight hours. — The handbook places no daylight-only limit on crossing a broken white line; the test is whether it is safe.
- D. Only when passing a motorcycle. — Nothing in the passage limits crossing a broken white line to passing a motorcycle; it is described as a general lane-change line.
Remember it
Broken white means same-direction traffic and permission to switch lanes, not an automatic right — check that the move is safe first.