So take a rake and a broom with you and groom the area as much as you can before you lay down the ground cloth. If noise doesn't bother you, consider yourself blessed, and read no further. Particularly on the day of set up, you can count on cars using the roads well into the wee hours of the morning. Roads mean cars. Cars mean car doors.
Doors mean slamming.
It may be nice to live by the side of the road and be a friend to man, but you'll be a lot friendlier if you take that traffic into account and leave the pathways clear for them. It also helps sometimes to identify where the noisy parts of camp are. If quiet is important to you, try to contact the group or individual that will be running the show and make a point of asking about it. It's always too late to try to establish the policy on the night you arrive. Groups and sites vary greatly in their ability to accommodate noise.