Motorists have been warned to expect significant traffic on two key roads as hundreds of thousands flock to an event near Wiltshire.

High traffic volumes are expected on the A419 and the A417 as drivers head to the Royal International Air Tattoo, at RAF Fairford in Gloucestershire, this weekend.

The event is expected to draw in crowds of between 150,000 and 200,000 people from Friday, July 14, to Sunday, July 16.

Traffic is expected to be particularly congested around Cricklade and Cirencester, while the M4 could also be affected at junction 15.

Motorists have been advised to plan their journeys ahead of time.

Kathryn Wiltshire, Southwest network planner for National Highways, said: “The network is likely to see higher traffic volumes and the Fairford event is expected to see increased volumes on the A417 and A419, and potentially increased traffic around M4 junction 15 and M5 junction 11A.

“Our aim is to keep the National Highways network running while keeping all road users safe and informed.

“We’re advising all drivers to check our traffic and travel information channels, to plan ahead and allow plenty of time for their journeys.”

Signage and messaging will be in place for those attending the event, with the showground set to open from 7.30am until 6pm on Friday and 7.30am to 7.30pm over the weekend.