What is the purpose of the green studs on motorways?

The purpose of the green studs on motorways is to mark slip roads, which are the exit or entry points for vehicles to leave or join the main motorway. These green studs are positioned at the edges of slip roads to provide a clear visual cue to drivers, helping them navigate safely during transitions from the motorway to adjacent routes or services.

This use of color coding is a deliberate measure to enhance safety and awareness for drivers, as it distinguishes slip roads from other features present on the motorway. Understanding these visual markers is essential for driving safely and effectively in an emergency response context, as it aids in quick decision-making when navigating high-speed environments.