The speed at which 85 percent of drivers travel at or below.
Maximum speed limit
In California, the maximum speed limit is 55 mph on a two-lane, undivided highway.
Selected freeways in California may be posted to permit a maximum of 65 or 70 mph. This is an absolute limit that may not be legally exceeded under any circumstance.
Prima facie speed limit
This Latin phrase means “on the face of it.” A prima facie limit is deemed reasonable and prudent under normal conditions. The prima facie limit is 15 mph in alleys, blind intersections and blind railroad crossings, and 25 mph in business and residential districts. There also is a part-time prima facie limit of 25 mph in posted school zones when school is in session.
Drivers may exceed a prima facie limit if it is safe to do so. If cited, they must prove they were driving in a reasonable and prudent manner according to existing conditions. The absolute limit, however, may not be exceeded.