First a big "Thank you" to all the people that make this happen. Without you this wonderful experience wouldn't be.
Enforce rules. A large sign at Lynda's "OBEY RULES OR BE EXPELLED" then enforce it. That should apply to racers also. If a racer or crew member brings a mini bike, or lets non-licensed ride they and their car should be warned once thrown out second time. Rules apply to everyone. I didn't bring a doodle bug because I thought it didn't pass rules, and saw kids racing motorized scooters in the pits.
Riches idea of two colors for push-crew vehicles and two lanes is good.
Two color maps at lands end with racers portion in red and "spectator vehicles are not allowed in restricted area" They could park outside the tape and walk short distances to visit the pits so they wouldn't be denied access. Handicapped excluded from this rule but explained procedures.
Extra orange stickers purchased by car owners or drivers only, with car number listed on sticker. That way any one that has one should know what is going on and proper procedures. I think it used to be this way but not sure.