One of the undeniable consequences of traffic is that car accidents
occur, which represent a high cost for society and accentuate
the mandatory intervention of public authorities in the maintenance
of road-traffic safety. According to the World Health Organization,
more than a million people are killed on the world’s roads
each year [33]. Road safety always implies a risk, but if the safety
levels reached were optimum, accidents could be minimized and
this risk would be more controlled and acceptable. A constant
effort is required from society to reach the steadily more stringent
safety levels. Prevention is by far the best option [9].