Examples are long acceleration lanes on motorways and large stopping sight distances at intersections, increased letter-height and retro-reflectivity of street name signs, etc. For intersections with traffic lights, errors in giving way and any resulting crashes can be prevented by a regulation that does not allow traffic that can collide to have green light simultaneously. Roundabouts have the required qualities for older drivers: e.g., left turns are eliminated, fewer decisions have to be made because of one-way traffic and yield-at-enter, lower speeds allow for more time to decide and act (Staplin et al., They reduce crash numbers and, as a result of lower speeds, crash severity.