Basic Speed Law: What is a Safe Speed on Freeways?

How Fast Can You Drive on Freeways?

Take a minute and consider the following question:

What is always a safe speed on freeways?

  A. 45 mph
  B. 55 mph
  C. 65 mph
  D. None of the above

The simple answer: no speed is safe at all times.

It is a fact that applies to all highways, not only freeways.

In other words, a posted speed limit of, for example, 55 mph does not always mean 55!

You can be stopped and charged with driving too fast even if you drive at the posted speed limit.

The Basic Speed Law

A posted speed limit shows the maximum speed you can drive under ideal conditions. You must slow down When weather conditions affect stopping distances and visibility. You must also slow down if other road or traffic conditions create a hazard.

This is known as the basic speed law or general speed law. The law exists in all states – even if the exact wording differs.

The fundamental speed law means you must use a reasonable and prudent speed under existing conditions.

You must never drive faster than is safe for current conditions or at a speed that endangers the safety of persons or property.

You Can Get a Ticket Even if You Drive at the Posted Speed Limit

If you drive at the posted speed limit when roads are icy or slick or when other traffic adjusts their speed to current conditions, and you don’t, you can be stopped and charged with driving too fast for the conditions.

DMV Questions and Answers by State