1.2.4. The Regulations require the use of white road studs in conjunction with double white lines (diagrams 1013.1 and 1013.5; S9‑6‑23 & S9‑6‑24 respectively). Guidance on the more general use of road studs is given in section 4. 1.2.5. Clarification of current policy on the use of edge of carriageway markings and associated