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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).
Design speed is not necessarily road's maximum safe speed. As highway design incorporates a significant factor of safety, drivers can travel faster than design speed without difficulty when good weather conditions are present. [4] The highest design speed for a road or segment is the design speed of its least favorable part.
The highest posted speed limit in the country is 85 mph (137 km/h) and can be found only on Texas State Highway 130, a toll road that bypasses the Austin metropolitan area for long-distance traffic. The highest speed limit for undivided roads is 75 mph (121 km/h) in Texas. Undivided road speed limits vary greatly by state.
The maximum speed of a Bugatti Chiron (the fastest production road car) is 305 mph. The Mitubishi Mirage (the cheapest car available in the US in 2023) tops out at 105 mph.
The advisory speed limit applies to any road in Germany outside of towns which is either a dual carriageway or features at least two lanes per direction, regardless of its classification (e.g. Autobahn, Federal Highway, State Road, etc.), unless there is a speed limit posted, although it is less common for non-autobahn roads to be unrestricted.
Highest-posted speed limits around the world. Kilometres per hour are on the left and miles per hour on the right.* A speed limit is the limit of speed allowed by law for road vehicles, usually the maximum speed allowed. Occasionally, there is a minimum speed limit. [1] Advisory speed limits also exist, which are recommended but not mandatory ...
VASCAR (Visual Average Speed Computer And Recorder) is a type of device for calculating the speed of a moving vehicle. The first VASCAR device was created in 1966 by Arthur Marshall. [ 1 ] It is used by police officers to enforce speed limits , and may be preferred where radar or lidar is illegal, such as some jurisdictions in Pennsylvania ...
Intelligent speed assistance uses information about the road to determine local speed limits. [2] Information can be obtained from knowledge of the vehicle position, taking into account speed limits known for the position, and by interpreting road features such as signs. ISA systems are designed to detect and alert a driver when a vehicle has ...