The speed limit for a car towing a trailer on a motorway in the UK is 60 mph (about 96 km/h), as long as no lower limit is signed.

Core rule

  • The standard motorway limit for cars is 70 mph, but this drops to 60 mph as soon as you are towing a trailer or caravan.
  • This 60 mph limit also applies on dual carriageways; on single carriageways the limit is 50 mph when towing.

Extra motorway restrictions

  • A car towing a trailer is not allowed to use the right‑hand (outside) lane on a motorway with three or more lanes, except in specific situations such as roadworks or lane closures.
  • You must still obey any temporary or variable speed limits on smart motorways or in roadworks, even if they are lower than 60 mph.

Safety and practical tips

  • Leave extra room for braking and avoid sudden lane changes, as the extra weight and length make the car–trailer combination less stable at speed.
  • If conditions are poor (heavy rain, strong winds, heavy traffic), driving below 60 mph is recommended for stability and control.

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