If there is good race organiser with PA system for the finals, then usually they'll call out "Car #6, you have got leader car #1 coming up behind you - please let him pass cleanly." If Car #6 cause a crash whilst other car is overtaking then (1) marshall should put car #1 back on track first and (2) car #6 gets a 'warning'.
Then again, if you're car #1 and you've got car #2 chasing your tail in the final, then haha, sure of course you drive
"fat"... leave no passing room if possible. But careful when
"closing the door" cos #2 can also easily take you out and t-bone you... and say "sorrylah, running 1-way, got no brek".