Mobile speed cameras are to target drivers heading to Cornwall for the annual Run to the Sun event at Newquay.
The festival is now in its 17th year
Police say the cameras will be used from Thursday until the end of the bank holiday weekend on Monday.
There have been complaints in previous years about cars being driven at high speed in some areas of the town.
Last year the Run to the Sun festival attracted a record 100,000 revellers, which caused some congestion on approach roads into Newquay.
The event started in 1989 as a meet for Volkswagen enthusiasts and has grown in popularity over recent years. It is now one of the UK's largest custom car festivals.
On Saturday and Sunday the cameras will be focused in and around the town and on bank holiday Monday camera units will track cars leaving the county.
The Devon and Cornwall Safety Camera Partnership says speed restrictions were enforced at last year's event which was virtually accident-free.
Organisers say its location in Newquay, which is classed as the "surf capital of the UK" is one of the many elements which contribute to its success.