The show runs from Thursday May 21 to Saturday May 23 and could attract between 90,000 and 100,000 visitors over the three days.
Drivers are advised that the north approach to Junction 30 of the M5 could be particularly busy between 8am and 10.30am on Thursday and Friday, when visitors to the show could be using the motorway at the same time as commuter traffic.
Saturday, May 23 is expected to attract the highest number of visitors and the south approach to junction 29 and 30 could also become particularly busy between 8am and 12am on Saturday when holiday traffic could make the M5 busier than usual.
Highways England is advising road users to plan their travel routes in advance, and to keep up-to-date with the latest road conditions.
Yellow signs will advise show visitors which route to take on the approaches to the show.
Members of the public should contact the Highways Agency Information Line on 0300 123 5000.
Journalists should contact the Highways Agency press office on 0844 693 1448 and use the menu to speak to the most appropriate press officer.