Posted By Mike Draper Refer to The Traffic Signs Regulations and General Directions 2002. http://www.opsi.gov.uk/si/si2002/20023113.htm As I understand it paint markings should be either white, yellow or red. The use of red appears to be restricted to red routes. White is used for most purposes but yellow seems common for parking restrictions, but I haven't read this to be able to say for sure what the exact requirements are.