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California's "Basic Speed Law", [18] part of the California Vehicle Code, defines the maximum speed at which a car may travel as a "reasonable and prudent" speed, given road conditions. The reasonable speed may be lower than the posted speed limit in conditions such as gravel—thus limiting the Assured Clear Distance Ahead (ACDA).
Most states have absolute speed limits, meaning that a speed in excess of the limit is illegal per se. However, some states have prima facie speed limits, [113] which apply only where the motorist or state does not prove that a different limit was reasonable and prudent in the case of a specific speeding charge.
For example, if you speed 10 miles per hour over the limit, the fine is $20 with $143 in court costs, according to the Florence law firm of Buzald, Funk and Zevely.
In 2020, previous results are confirmed for the year 2019: mean car speed was reduced between 2.9 and 3.9 km/h, while mean speed of trucks was reduced by 2 km/h without speed limit change. By the same time, fatalities were reduce by 125 in the second semester 2018, by 84 in the first semester 2019, and 127 for the second semester 2019. [127]
According to a 1994 report by the AASHTO, "experience has shown that speed limits set arbitrarily below the reasonable and prudent speed perceived by the public are difficult to enforce, produce noncompliance, encourage disrespect for the law, create unnecessary antagonism toward law enforcement officers, and divert traffic to lesser routes". [57]
The word derives from the 14th-century Old French word prudence, which, in turn, derives from the Latin prudentia meaning "foresight, sagacity". It is often associated with wisdom, insight, and knowledge. The virtue of prudence is the ability to judge between virtuous and vicious actions, not only in a general sense, but with regard to ...
Any person or persons who wilfully compare or contest relative speeds by operation of one or more motor vehicles shall be guilty of racing, which shall constitute reckless driving under RCW 46.61.500, whether or not such speed is in excess of the maximum speed prescribed by law: PROVIDED HOWEVER, That any comparison or contest of the accuracy ...
The speed values in this table are produced from the formula using an "average" coefficient of friction (μ) of 0.7, and a perception-reaction time of 1.5 seconds. Speed values specific to a given circumstance can be obtained with the same formula using the appropriate reference constants specific to the circumstance.