Last-minute getaways to hit traffic
As many as 20% of road journeys are likely to affected by delays on the August bank holiday weekend, it has been predicted.
There were likely to be "highly unpredictable" traffic conditions due to people making last-minute decisions to travel, the Trafficmaster company forecast.
Congestion peaks over each day of the bank holiday will increase from two to four hours a day compared with a normal weekend, the company said.
A Trafficmaster spokesperson added: "With the on-going troubled economic situation and people wary about spending money, we are predicting many motorists will make a last-minute decision about getting away for the August bank holiday weekend.
"These unplanned holiday and leisure trips could lead to highly unpredictable traffic conditions and longer delays over the bank holiday compared to a normal holiday weekend."
Trafficmaster listed a number of congestion hotspots over the bank holiday. These included sections of the M25, the M5 southbound to the West Country, the M6 to the Lake District and the A11 through Newmarket in Cambridgeshire.
The company also warned travellers of the traffic that will build up due to the many events on during the bank holiday weekend, including the Reading Festival in Berkshire, the Notting Hill carnival in west London and Clacton Air Show in Essex.
Those travelling by rail will have to contend with engineering work over the bank holiday weekend, with buses replacing trains on some routes.
There will be 3,428 buses running over the holiday weekend compared with 3,339 last August bank holiday.
Meanwhile, a survey by serviced office operator Business Environment shows that 25% of people return to work tired after a holiday and 11% feel more stressed than before they left. Also, 21% said they feel so bad on their return to work that they want to change jobs.