Which types of roads are perceived to have a higher accident risk?

Why this is the correct answer

Conventional roads, particularly single-carriageway roads without a physical barrier separating opposing traffic directions, are statistically the most dangerous roads in Spain. According to DGT data, approximately 75-80% of traffic fatalities occur on conventional roads. The main reasons are: 1) Head-on collisions are possible because there is no median barrier separating directions of travel. 2) Variable and often mixed traffic (cars, trucks, tractors, cyclists, pedestrians). 3) Frequent intersections, access points, and level crossings. 4) Narrower lanes and often no hard shoulder. 5) Greater diversity of speed among road users. By contrast, motorways and highways (autopistas y autovías), despite higher speeds, are designed with safety features — physical separation of traffic directions, no level crossings, controlled entry/exit points, and wider lanes — making them statistically much safer per kilometre travelled. Do not confuse higher speed with higher risk: road design matters far more.