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How Speed
Limits Are Set
Speed limits established by California Vehicle Code are:
- 15 mph in alleys.
- 25 mph in a residence or business district.
Other streets that are not defined as a
local street or road require an engineering and traffic survey
to determine the speed limit.
An engineering and traffic survey is conducted
using a sampling of the speeds of 100 free-flowing vehicles.
The highest speed that 85% of the vehicles are traveling
is determined by the survey. This is called the 85th percentile
speed. This 85th percentile speed is used as a
guideline in determining the speed limit.
Factors such as land use, pedestrian activity,
accident history and curves in the road are also considered
and can account for speed limits set below the 85th
percentile speed.
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