Update - 4.25pm: The Highways Agency has now lifted its major congestion warning on the A30 at Bodmin and the M5 heading towards Exeter.
Traffic still remains busy on the A30 however, but the Agency said it expects the worst of the delays to have now passed.
Earlier - 2.30pm: THE holidaymakers are on their way to Cornwall and the west - as congestion is reported on the M5 and A30 this afternoon.
This weekend is the first of the school holidays and the roads heading to the west are started to fill.
The Highways Agency said traffic is building up westbound between Launceston and Bodmin on the A30.
Delays are currently running at around 20 minutes with the average speed of traffic down to 25 miles and hour.
The Agency said it expects the congestion to ease into the afternoon.
Up country on the M5, there is also heavy traffic southbound between Taunton and Exeter with speeds dropping to 40 miles per hour on the motorway.