The maximum posted speed limit should be driven only:
- During the night.
- During the day.
- Under ideal conditions. ✓
Answer: C. Under ideal conditions.
Drive at the maximum posted speed limit only when conditions are ideal.
Why this is the answer
The handbook's Basic Speed Law says you may never go faster than is safe for the road as it is right now. It lists traffic, road surface, bicyclists or pedestrians, weather, and congestion as reasons to slow down. It also calls the posted maximum an ideal maximum speed limit. So the top posted number is a limit for good conditions, not a speed to keep when rain, traffic, or a rough road makes the safe speed lower.
Why the other answers are wrong
- A. During the night. — Night driving is not the special condition for using the top posted speed; darkness can be a reason to slow down under the Basic Speed Law.
- B. During the day. — Daylight alone does not make the top posted speed safe; the handbook says speed depends on traffic, road surface, weather, and other current conditions.
Remember it
Think of the top posted number as a limit for a perfect day, not a speed to match when anything around you is less than ideal.
Official handbook: California Driver Handbook (DL 600), Section 8: Safe Driving, p. 67