Each year in Germany, up to 80 accidents are caused by drivers on the wrong side of the road, of which many are on- and off-ramps to a main highway. To prevent this, a pilot test has been devised to alert drivers to their wrong-way direction. Cold plastic, one-sided rumble strips are being installed on the road surface within a 100cm-wide by 2cm-deep recessed groove across the lane. The specially shaped cold plastic coating with an uneven, rough bulge gives drivers a strong tactile and acoustic signal, aler