These road studs are made by 3M and are the most commonly seen on the UK road network. They are specially designed for long-term temporary installations or permanent installations. The 290 Road Stud or Cats Eye as it is commonly known is available with a white body or yellow body, which you can choose from above. The stud is attached to the surface of the road using either HotMelt or Coldfix. A third option is available, this uses a metal shoe to hold the stud, making it suitable for use on extra high volume applications. Which Colour Of Stud Where? If using these on a private road or car park you will likely only require white reflectors, however, on the public highway, the position of different colours of studs is regulated tightly. White – These are the most commonly seen colour of stud reflector. White studs are situated on the centre line of a carriageway to separate lanes. Red - These indicate the left-hand side of the carriageway and show a “line that should not be crossed”. Green - These are used on dual carriageways and motorways to indicate a slip road entrance or a layby. Amber - On the motorway these indicate the central reservation or the inner edge of an exit ramp. On a one way road, they are used to indicate the right-hand side of the carriageway, which should not be crossed.