Additional safety measures will be introduced around the Clacket Lane Service Area on the M25 near Westerham in Kent later this month. Work will involve installing solar-powered road studs and repainting all road markings.
http://nds.coi.gov.uk/Detail.aspx?NewsAreaId=2&ReleaseID=405001&SubjectId=12
seen at 14:15, 21 July in National Audit Office News - national.