There is,of course,the other option of 'service stations'.These would be placed around the track at varying intervals,some would provide fuel,others tyres.The driver would have to stop and refill his car (via the usual road car filler) when his fuel guage reads zero.Or stop and have his tyres changed by 'kwik fit' personel.This would also provide a sprinkling of 'real world' entertainment.
P.S. None of the above post should be taken (too) seriously.
Although,I suppose two drivers fighting over the same parking space also has that element of 'real world' about it.