According to the RAC, this weekend is one of the worst times of the year to be travelling and has warned drivers to prepare for long delays.
Motorists are expected to make more than nine million leisure journeys by car between Friday and Sunday, across the UK as roads gear up for the start of the school holidays.
Traffic is predicted to peak on Friday with 3.8 million motorists making a day trip or driving to holiday destination with regular commuter traffic.
Transport data firm Inrix warned that some routes, will experience long delays compared to normal Fridays.
Busiest days and times to travel:
||Number of cars predicted on the road
||Worst time to travel
||Best time to travel
||Worst roads for delays
|Friday 20th July
||2pm to 5.30pm
||7pm to 9pm
||M40 south, J3a to J1a: 1hr 30min delay at lunchtime M5 south, J12 to J31: 1hr 17min delay late afternoon M5 north, J31 to J12: 1hr 9min delay mid-afternoon A303, M3 to A37: 52min delay late afternoon
|Saturday 21st July
||11.30am to 1pm
||7am to 9am
||M25 anticlockwise, J23 to J16: 40min delay early afternoon M1 north, J6 to J23a: 20min delay late afternoon
|Sunday 22nd July
||12pm to 1pm
||7am to 9am
||M25 anticlockwise, J23 to J16: 30min delay at lunchtime M40 south, J3a to J1a: 20min delay late afternoon
Drivers should expect gridlock and warning that delays could be even worse the following weekend (27th-29thJuly)