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In the UK, the typical total stopping distances (thinking distance plus braking distance) used in The Highway Code are quoted in Rule 126 as: [24] 20 mph: 40 feet (12 metres) 30 mph: 75 feet (23 metres) 40 mph: 118 feet (36 metres) 50 mph: 175 feet (53 metres) 60 mph: 240 feet (73 metres) 70 mph: 315 feet (96 metres)
d MT = braking distance, m (ft) V = design speed, km/h (mph) a = deceleration rate, m/s 2 (ft/s 2) Actual braking distances are affected by the vehicle type and condition, the incline of the road, the available traction, and numerous other factors. A deceleration rate of 3.4 m/s 2 (11.2 ft/s 2) is used to determine stopping sight distance. [6]
Now, the total stopping distance is the sum of the braking and perception-reaction distances: ... (30 mph) intercept object (i.e. deer) HSD [meters] HSD [feet]
The rule is not a guide to safe stopping distance, it is more a guide to reaction times. The two-second rule tells a defensive driver the minimum distance needed to reduce the risk of collision under ideal driving conditions. The allotted two-seconds is a safety buffer, to allow the following driver time to respond.
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 .
In 1934, a new limit of 30 mph (48 km/h) was imposed in urban centers, and in July 1967, a 70 mph (110 km/h) national speed limit was introduced. ... Braking distance ...
Braking system Train speed Distance Stopping time (s) mph km/h yd m Continuous (vacuum) 45 72: 410 370 26 Continuous (vacuum) 45 72: 451 412 30 3 brake vans: 40.9 65.8: 800 730 59 2 brake vans: 40.9 65.8: 631 577 44 2 brake vans: 45 72: 795 727 55 1 brake van: 45 72: 1,125 1,029 70
Then there is the stopping distance, which is the distance a vehicle travels from the moment a condition requiring a stop comes in sight until the vehicle actually comes to a halt. This depends on lots of things, such as the reaction speed of the driver, the speed of the vehicle, the condition of its brakes, the condition of the road surface ...