No,
we do not design roadway surface to control how fast cars can travel. What
controls how fast cars can travel is the roadway’s design alignment such as the
roadway’s radius of curvature and how much the cross slope of the curve is
superelevated (banked). Keep in mind that wet weather and sight distance
also control how fast vehicles can travel. We post speed limit signs
(white signs) for speed enforcement and warning speed and/or condition signs
(yellow signs) to alert motorists in advance.
If you have any transportation related questions that you would like Caltrans to answer please feel free to tweet them to us @CaltransD4
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