Consider intersections and traffic lights for routing

[rheyse]

Intersections and traffic lights are both costing time for cyclists and might be dangerous. This could be included in the route planner in the future. One thing to consider is that certain traffic lights in Brussels allow right turns, and might have different rules for cyclists. See Brussels street signs B22 and B23: https://wiki.openstreetmap.org/wiki/Road_signs_in_Belgium#B22