Trailer Lighting Rules

A Simple, Condensed Guide on Trailer Lighting Rules


Trailer Lighting Rules

Lighting Regulations vary, depending on the Trailer type;

  • O1 Trailers Very lightweight trailer with a GW of 750kg or less.
  • O2 Trailers Lightweight trailer with a GW from 750kg to 3500kg.
  • O3 Trailers Heavy duty trailer with a GW between 3.5T to 10T.
  • O4 Trailers Heavy duty trailer used in recovery where normal C&U limits are exceeded.


  • All Reflectors must be e or E marked (See Table 1)
  • The correct quantity should be fitted to the trailer (See Table 1)
  • The correct colour must be fitted to the trailer (See Table 1)
  • Must be positioned to meet;
  • position / visibility requirements (See Table 1)
  • Must be the correct shape (See Table 1)
  • Rear reflectors must face predominantly to the rear (See Table 1)

For additional information on Trailer Reflectors and for Tables and Figures, please Click Here.


  • The trailer must be fitted with lamps only capable of showing a white light to the front except;

An amber light from an Indicator, Amber light from beacon, yellow light from conspicuity material. Amber light from a side marker, green light from an ABS light. Emergency vehicles only – a blue light from warning lamp or beacon.

  • Trailer must be fitted with lamps only capable of showing a red light to the rear except for;

See below

An amber light from a direction indicator, amber light from warning lamp, white light from work lamp / reversing lamp. A yellow light from conspicuity marking material and amber light from a side light therefore applicableemergency vehicles only – a blue light from warning lamp or beacon.

  • The operation of one lamp, must not effect the other, unless specifically designed to do so
  • All lamps, markers and reflectors must be securely fitted
  • All obligatory and optional lamps must be fitted to their correct orientation
  • When every door or other moveable part is in the fixed open position the front and rear lamps, indicators and reflectors must fulfil the following conditions;

Please see below

Half of the apparent surface of the lamp is visible from directly in front of / behind as appt the trailer. OR, additional fully visible lamp satisfying all requirements for the above lamps. OR, a notice on the trailer must inform the user that certain positions of the moveable components. other road users should be warned of the presence of the trailer on the road.

For additional information on Trailer Light Installation, please Click Here.

If you wish to know the lighting rules and regulations on specific trailer lights, please follow the links below;

End-Outline Position Markers

Direction Indicators

Number Plate Lights

Fog Lights

Reverse Lights