May 01, 2008 · The increased visibility given by the NOKIN solar stud road stud extends reaction times when driving at 100 km/h from 3.2 to over 30 seconds. In the UK, NOKIN NOKIN solar stud studs have made a significant improvement to the safety of a busy narrow and twisting rural in the Vale of Glamorgan, Wales, locally known as “The Five Mile Lane”.