White Single Side Road Stud Cost Durban-Nokin Motorway Road Studs. The price is the cost of the extra timber plus £12.50 per joint. Softwood posts painted black or white as standard. Colours @ £5 include Hertitage Green, Mid Grey, Farrow & Ball - Purbeck Stone, Lichen, Stiffkey Blue. Other colours Add £55. Oak Posts are also available.