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Braking distance refers to the distance a vehicle will travel from the point when its brakes are fully applied to when it comes to a complete stop. It is primarily affected by the original speed of the vehicle and the coefficient of friction between the tires and the road surface, [Note 1] and negligibly by the tires' rolling resistance and vehicle's air drag.
Highway hypnosis is often a precursor to falling asleep at the wheel, so at the first signs of drowsiness, the driver is advised to stop the car and rest or do light physical exercises. [10] It is also recommended to take breaks every three hours of monotonous driving, even if the driver does not feel tired. [7]
For heavy duty commercial vehicles it is recommended 4-6 seconds following distance for speeds under 30 mi/h (48 km/h), and 6-8 seconds following distance for speeds over 30 mi/h (48 km/h). [9] Rear-end collisions are the number one type of traffic collisions .
The two-second rule is useful as it can be applied to any speed. Drivers can find it difficult to estimate the correct distance from the car in front, let alone remember the stopping distances that are required for a given speed, or to compute the equation on the fly. The two-second rule provides a simpler way of perceiving the distance.
The Official Highway Code, 17th edition cover, 2022. The Highway Code is the official set of information and guidance for road users in the United Kingdom.Its objective is to promote the safe and efficient use of the road network.
A non-primary road sign near Bristol shows Guildford Rules patches.Road signs in the United Kingdom and in its associated Crown dependencies and overseas territories conform broadly to European design norms, with a number of exceptions: direction signs omit European route numbers, and road signs generally use the imperial system of units (miles and yards), unlike the rest of Europe (kilometres ...
A simple graph of car stopping distances: Date: 14 November 2008: Source: Generated from the "cars" dataset in the R statistical package: Author: HYanWong .
The design is intended to provide a guide for drivers to maintain a safe distance between vehicles. Road signs can be found along motorways, to indicate the safe distance (1 line = too close, 2 lines = safe distance). At some points (tunnel, bridge, narrow road with no shoulder, tight curve) the edge line becomes solid.