Road spline, centre line, 60mph, 8m wide, with medium traffic level. Designed to be 0.2m over baseboard level for correct car height. Texture derived from those by cgtextures.com and 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.