Many small roads do not have painted markings along their edges  Clear edge markings would make it easier for drivers to see upcoming curves and to judge the car' s position on the road, particularly when visibility is poor, and would ttherefore seem to be a useful contribution to road safety
However, after Greatwater County painted edge markings on all its narrow, winding roads, the annual accident rate along those roads actually increased slightly
In bad weather it can be nearly as difficult for drivers to see the road as it is at night.