What Lights Do I Need on My Trailer?

Friday 14th October 2022

The lighting you need all depends on when your trailer was built. You’re going to need to know what you need as it is a legal requirement to have the correct and working lights, reflectors, and markers the same as you would on a car. 

The DVSA check retro reflectors for:

  • Number fitted 
  • Colour 
  • Position 
  • Shape
  • Approval marking (if required)
  • Identity symbol (if required)

Before September 30th, 1990

All trailers must be fitted with the following:

  • Two red side lights
  • Two red stoplights
  • Two red triangular reflectors 
  • An illuminated number plate
  • Amber indicators that flash between 60-120 per minute


Built after September 30th, 1990

  • Must also be fitted with front white reflectors

More than 1.3 Metres Wide

  • Must also have at least one red fog lamp

More than 1.6 Metres Wide

  • Must also have front position white lights

Trailers longer than 6 Metres (excluding the drawbar)

  • Must also have red/white side markers.  Side markers are only a legal requirement when the trailer is above 6m in height.


Built after October 2012 

  • Must also be fitted with a reversing light. 


As well as having the correct lights, indicators, and markers there is also legal requirements for how you fit them to the trailer. 

  • Indicators should be between 350mm and 1500mm from the ground.
  • Indicators should be a maximum of 400mm from the side of the trailer.
  • Indicators should be a minimum of 400mm apart.
  • Triangular reflectors should be positioned, between 250mm and 900mm from the ground, with a minimum separation of 600mm and no more than 400mm from the sides.
  • Two fog lamps must be separated and positioned at opposite sides of the rear of the trailer.
  • Fog lamps should be placed within 250mm and 1000mm from the ground.
  • Fog lamps should be a minimum of 400mm apart.
  • There should be at least 100mm of separation between the fog lights and the tail lights/indicators.


To find out more legal information about trailer lights click here

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