Author | Arantxa HerranzDespite the efforts to reduce road traffic in urban centres, cars are still one of the most popular means of transport for a large percentage of the population; in the European Union alone, cars accounted for 82.9% of inland passenger transport in 2016. This increase in vehicles on the road and in cities brings with it traffic congestion and the subsequent delays in transport.As a way of regulating the presence of vehicles, many cities choose to install traffic lights, particularly at intersections. The aim of these signalling devices is to improve the safety of vehicles and pedestrians when crossing streets and, to do so, traffic flows are programmed. However, traffic lights are not the perfect solution, since they reduce the efficiency of vehicles: they have to wait until the lights change to green.This inefficiency is even more pronounced in terms of emergency vehicles such as ambulances, fire engines and police vehicles, which have to be capable of reacting to emergency calls as quickly as possible. In fact, their excellence as an emergency service very often depends on how quickly they are able to get to the site of an incident.These emergency vehicles do always have priority over others at signalised intersections and they are even authorised to ignore these signs (with due caution). But these actions also entail a risk. In the United States, there are an estimated 6,500 accidents involving ambulances each year and 35% of crashes resulted in injury or fatality to at least 1 occupant of a vehicle involved.
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