A go slow protest against Brexit looks set to cause disruption on the M4 and M5 later today (March 22).
Brexiteers say they will drive slowly and form a blockade from 5.30pm, moving along the M5 southbound to Clevedon and then along the M4 to Bath.
Similar protests have been organised by anti-EU group Brexit Direction Action across the country.
According to the Highways Act 1980, it can be an offence to obstruct the road by slowing or stopping your vehicle.
The code reads: "If a person, without lawful authority or excuse, in any way wilfully obstructs the free passage along a highway he is guilty of an offence and liable to a fine not exceeding."
According to the Ask the Police website: "This offence (wilfully obstruct the highway) is committed when there is an obstruction of the highway (the slowing down or stopping of vehicles).
"The obstruction must be wilful (not accidental) and there must be no lawful excuse for the obstruction."
"Lawful excuse would include express permission or situations where the obstruction is fleeting and limited in terms of space."
"For example, if a group of taxi drivers are protesting over the price of petrol and are driving slow through a city centre during rush hour traffic."
The penalty for wilfully obstructing the highway is a fine.
An Avon and Somerset Constabulary spokesperson said the force would deal with "any unlawful obstruction or any motoring offences as they become apparent".
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