From what I saw over the weekend, traffic flow was excellent. I believe a private company was used this year to plan the routes and control parking and this appears to have been a great success.
The only long queue I saw was on the dual carriageway running north from the M4 at Swindon but even that was moving at a steady rate. The situation might have been helped by numbers being down on previous years, partially due to Silverstone and problems last year putting people off.
The Park and Ride was under used and looked like a good option.
If you didn't go this year because of transport fears then you missed out, the show was excellent. Don't miss the next one!
Cheers
TeeS