Road marking spline, centre line line, 60mph, with busy traffic level. Designed to be lowered 0.2m to baseboard level for correct car height. Texture by Andi06. To diagram 1008.1. See http://www.legislation.gov.uk/uksi/2002/3113/schedule/6/made and http://www2.dft.gov.uk/pgr/roads/tss/tsmanual/trafficsignsmanualchapter5.pdf for details.