Police found a quantity of cannabis after stopping a car on a motorway.

Hertfordshire Constabulary says it was alerted to a vehicle of interest travelling on the M1 at 11.35pm on Monday, September 14.

The vehicle was stopped by officers near junction 5 (Watford) and a search was carried out, the force said.

Police say that a quantity of cannabis was found.

A 27-year-old man was arrested on suspicion of possession of a class B drug and driving under the influence of drugs.

He has been released under investigation while enquiries continue.