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4. If 3. cannot be satisfied then separate, or reduce the angle, or reduce the speed to 50 km/h.
5. Car occupants should not be exposed to oncoming traffic (other vehicles of approximately same weight) at speeds exceeding 70 km/h or 50 km/h if oncoming vehicles are of considerably different weight (Fig. 3).
6. If 5. cannot be satisfied then separate, homogenise weights or reduce speeds to 70 (50) km/h.
7. Car occupants should not be exposed to the road side at speeds exceeding 70 km/h, or 50 km/h if the road side contains trees or other narrow objects (Fig. 4). 8. If 7. cannot be satisfied separate or reduce speed to 70 (50) km/h.
Fig. 1. A road (Highway 204, China), where space is thought to be the safety feature resulting in more than 1 killed/km/year.
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Fig. 2. The probability of pedestrian fatality as a function of impact speed (Anderson et al., 1997).
Fig. 3. A redesigned rural road in Sweden with 2 + 1 lanes and mid-barrier, resulting in a reduction of fatalities by 80–90%.
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Fig. 4. A simulated collision into a tree. The picture shows the approximately position of the tree after a 70 km/h crash.
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