Peri-urban automated highway scenario design based on a safety approach


Type de document
Résumé / Abstract
This paper deals with a scenario of road automation design based on a safety approach. The study shows the potential safety/capacity benefit of some different new future technologies that could be introduced in the highway. We present two scenarios which correspond to the combination of different new best technologies that leads to interesting results. The chosen safety criteria is based on the ability of the cars to avoid collisions. It corresponds to the following two emergency situations: firstly a vehicle is suddenly braking until stop or secondly an obstacle is present on the road. In first safety level, we ensure that all vehicles located behind the suddenly braking until stop car can stop without collision. With respect to this assumption a minimal safety distance function of speed, capacities to break, and automatism or driver time reaction is computed. This distance is directly translated into a capacity for a single lane and corresponds somehow of the maximal lane capacity. In second level safety, we cannot ensure that there will be no collision since an obstacle can be located suddenly few meters in front of a vehicle. But we can define indicia of safety as the mean number of collisions that probably will happen. Obviously the safety indicia will depend on the distances between vehicles, and therefore is linked with the capacity of the lane. The problem is to find the best combination of technologies that give a higher capacity and a smaller safety indicia.

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