Warwickshire Police are warning those travelling to the Bulldog Bash motorcycle festival in Long Marston to allow extra time.
The Bulldog Bash returns to Stratford-upon-Avon today after a year out.
More than 4,000 campers are expected at the motorcycle and music festival which runs until Sunday.
The event includes drag strip demos, fairground rides, food and the custom show tent for bikes.
The festival has been held at Long Marston Airfield since 1987 and attracts bikers from across Europe.
The Bulldog Bash has been hit by controversy over the years. In 2007 Hells Angel member Gerry Tobin was shot in the back of the head while riding home from the festival on the M40.
Seven members of rival gang Outlaws were sentenced to a total of 191 years in prison for his murder.
Warwickshire Police say they will have an increased police presence in the area during the festival and are warning people to plan their travel arrangements in advance.
One of the Midlands' most popular motorcycle shows has been cancelled due to unknown circumstances.
Organisers of The Bulldog Bash 2013 have announced on Facebook that it will be regrouping for 2014.
The festival, which takes place at the Shakespeare County Raceway in Warwickshire, has continued to attract bikers from all over Europe, with up to 10,000 people descending on the four-day event.