Amber reflective studs on a motorway mark the boundary between the lanes and the central reservation, helping drivers stay safely away from oncoming traffic, especially at night or in poor visibility.

Stud Locations

These studs run parallel to the central reservation, whether it features metal barriers, concrete dividers, or grassy verges. They appear consistently on straight stretches, curves, junctions, and low-visibility areas like tunnels or fog-prone zones.

Why They Matter

Amber studs shine brightly in headlights, providing a clear guide when road markings fade in rain, snow, or darkness. Per UK Highway Code Rule 132, they highlight the right-hand edge of the carriageway next to the reservation.

Colour Guide

  • Red studs : Left-hand edge of the road.
  • White studs : Between lanes.
  • Amber studs : Central reservation edge.
  • Green studs : Slip road joins.

TL;DR : Amber studs are strictly between the hard shoulder/lanes and central reservation on UK motorways.

Information gathered from public forums or data available on the internet and portrayed here.