What's the Minimum Speed on a Highway?

The standard speed limit is 70 mph for rural freeways, a 45 mph minimum speed limit, 65 mph for other 4 lane divided highways, and 55 mph for all other highways.

Why is there a minimum speed on highways?

Many states in the United States have minimum speed limit regulation signs posted especially along interstate highways. The minimum speed limits are posted on the same signs with maximum speed limits (Fig. ... The purpose of implementing minimum speed limit signs is to prevent traffic congestion (Haney and Weber, 1974).

What is the minimum speed law for?

Vehicle Code 22400 VC – Minimum Speed Laws in California. California Vehicle Code 22400 VC — the minimum speed law — prohibits drivers from slowing or stopping as to impede the normal flow of traffic. The section also disallows motorists from driving at a speed below an established minimum speed limit.