Respecto al tipo de vía, las que parecen presentar un menor riesgo de accidente son:

Motorways and dual carriageways are considered the safest roads for several reasons. First, the two directions are separated by central reservations, so it is very hard to hit a vehicle coming the other way. They have no difficult bends, and they have several very wide lanes in each direction, which makes traffic flow easier and reduces the risk of collisions. They also have no junctions, which reduces accidents caused by crossing manoeuvres. Finally, the maximum speed on motorways and dual carriageways for cars and motorcycles is 120 km/h, which allows smoother and safer traffic.