Always carefully look for motorcycles before you change lanes because:

  1. Their small size can make them hard to see. ✓
  2. They usually have the right-of-way at intersections.
  3. It is illegal for motorcycles to share traffic lanes.

Answer: A. Their small size can make them hard to see.

Look carefully for motorcycles before changing lanes because their small size makes them hard to see.

Why this is the answer

The handbook says motorcyclists are smaller than other vehicles and harder to see, so they can disappear into your blind spots. That is why it tells you to check for motorcycles and use your mirrors when you change lanes or enter a road. The reason to look twice is that a bike you miss is a bike you could move into.

Why the other answers are wrong

Remember it

A bike can hide in your blind spot, so turn your head and check the mirror before you move over.

Official handbook: California Driver Handbook (DL 600), Section 7: Laws and Rules of the Road, p. 44

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.