Question 1

What is the maximum speed limit for a commercial vehicle in a school zone when children are present, if no speed limit is posted?

Accepted Answer

15 mph is the standard speed limit in a school zone when children are present and no other speed limit is posted.

Question 2

What does 'basic speed law' require of a commercial driver?

Accepted Answer

The basic speed law requires drivers to never drive faster than is safe for current conditions, regardless of the posted speed limit.

Question 3

On a highway with no posted speed limit in a rural area, what federal guideline applies to commercial vehicles?

Accepted Answer

Commercial drivers must drive at a reasonable and prudent speed for conditions; many states default to 55 mph for trucks when no limit is posted.

Question 4

Why are large commercial vehicles often subject to lower speed limits than passenger cars on the same road?

Accepted Answer

Due to their greater weight and size, commercial vehicles require longer stopping distances and have higher rollover risk, justifying lower speed limits.

Question 5

At an uncontrolled intersection, which vehicle has the right of way?

Accepted Answer

The vehicle that arrives first has the right of way. If two vehicles arrive at the same time, the vehicle on the right has the right of way.

CDL General Knowledge: Traffic Laws & Signs

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