Fuel price protests are set to make traffic jams worse tomorrow as schools break up for the summer season, police have warned.
In what is expected to be the the busiest summer getaway in at least eight years, protestors are set to march the streets.
Avon and Somerset Police have warned motorists that "slow-moving roadblocks" are planned on parts of the M4, M5, M32 and A38 on Friday.
Fuel Price Stand Against Tax posted an image on their Facebook group suggesting demonstrations will take place 'nationally' - including Birmingham, Cardiff, Liverpool, London and Manchester.
This could cause disruptions on the roads as most schools in England and Wales are breaking up for the summer this week, with the RAC estimating that 18.8 million car trips have been planned between Friday and Monday - the most since 2014.
Superintendent Tony Blatchford of Avon and Somerset Police has now urged drivers to consider "alternative travel plans" due to the pump price protests.
He added: "Our protest liaison team has been engaging with the organiser so we can inform the public of the likely disruption and help to minimise it.
"Nevertheless, drivers can expect journey times will likely be longer than normal, especially on motorways, which often tend to be at their busiest at this time of year.
"We advise motorists to consider any alternative travel plans available and ensure they are suitably prepared in case they are delayed."
Drivers have been warned that the first stage of Friday's action in the South West will see vehicles travel north on the M5 between Bridgwater and the Almondsbury Interchange from about 8.45am, then east along the M4 and to Junction 1 of the M32.
The convoy is expected to leave the motorway and stop "for a period of time" before completing the same route in reverse, arriving back in Bridgwater "in the early afternoon", police have announced.
A second group of protesters is planning to drive slowly to the Shell petrol station in Bristol Road, Bridgwater.
According to police, "They are expected to block the forecourt during the morning."
Fuel price protests have already led to people being arrested - with 12 jailed on July 4 after protests on the M4.
Meanwhile, figures from data company Experian show the average price of a litre of petrol on Wednesday was 187.5p, while diesel was 196.1p.
Furthermore, there are likely to be long queues at the Port of Dover again on Friday.
On Thursday, travellers were forced to queue for up to three hours just to complete border control and check-in.
A spokesman for the port said: "As a result of high demand and earlier capacity issues at the border, the port system is working hard to catch up and to get everyone through as quickly as possible.
"Passengers will be placed on the first available sailing and will be away on their holidays shortly."
