Took us about an hour to drive there at about midnight, delays were mainly caused by all the coaches dropping people off. By the time we left about 0230 the roads looked pretty clear.
we followed sleep envy at about 10:30 traffic was busy but moving, then headed to muslane an hour or so afterwards with no problems other than the french police blocking random roads on the way and then unblocking and blocking others instead on the way back.
We went at midnight and though it took ages to get there we did get to watch from the famous corner. Clear driving back at 3am so I thinhk we'll head out at that time next year.