You might have never noticed but the
reflective solar cat eye road studs on the roads are actually different colours. Ever wondered why reflective solar cat eye road studs are different colours on the motorway? Is it just to look pretty? The answer is no, it's not just to make your night-time drive a little bit more scenic or keep you awake with pretty lights.
The colours of the reflective
solar cat eye road studs serve a genuine purpose - and can really help you out when visibility is poor on unlit sections or in heavy fog. The cat eye road studs have been around since the 1930s and the details of how they work are laid out in Rule 132 of the Highway Code. There are four main colours: red, green, white and amber - plus a green/yellow that appears on occasion.
The most common LED color of solar cat eye road studs you'll see will be the standard white as these mark the lanes or the middle of a road. On a regular three-lane wide motorway you'll see two rows of solar cat eye road studs.
Amber solar cat eye road studs appear on the far side of the road to mark the central reservation - and to stop you mindlessly changing lane to the right. By contrast, red lights denote the left edge of the road - before you hit barriers or drift onto the hard shoulder.
The least common of the regular
solar cat eye road studs are green which appear to break up the red strips on the inside. Green tells you that this part of the motorway can be driven over as there's a slip road lay-by or a bus stop on some A-roads. The final colour you might see is green/yellow with these studs indicating temporary changes to lane layouts, for example during roadworks.
