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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.
The braking distance will be approximately 250 m (820 ft) at 100 km/h (62 mph) and 600 m (2,000 ft) at 160 km/h (99 mph). High-speed trains are usually equipped with a magnetic track brake, which can give about 0.3 m/s 2 extra, and give braking distances of about 850 m (2,790 ft) at 200 km/h (120 mph) and 1,900 m (6,200 ft) at 300 km/h (190 mph).
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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 Zimbabwe National Road Administration (ZINARA) falls under the Ministry of Transport, Communication and Infrastructural Development and was established in August 2001, in terms of the Roads Act of 2001 with the aim of enhancing road network system throughout the Zimbabwe.
Fines are charged for excess speed of 6 – 49 km/h above the applicable limit and speeding at 50 km/h or more above the applicable limit results in a court appearance.
The road carries between 1,000 and 5,000 vehicles per day, with the heavier flows in the proximity of Harare. It is therefore proper to rehabilitate this road. The Harare-Beitbridge road is part of the trunk road network of Zimbabwe, which is a part of the North-South Corridor – one of the major arterial links in the regional road network.