California has a Basic Speed Law, which means that:

Drivers can disregard the posted speed limit when it is raining, foggy or snowing, windy, or dusty.
Drivers must always drive at least 10 MPH less than the posted speed limit.
Drivers may never drive faster than is safe for current conditions.
Explanation

The posted speed limit is the maximum legal speed that drivers can travel on a road under ideal conditions. California’s “Basic Speed Law” means that you may never drive faster than is safe for the current conditions. Regardless of the posted speed limit, your speed should depend on the current road and weather conditions.

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