I reported this at SA-MP awhile ago.
0.2
Very rarely a checkpoint wouldn't work, even if you tried to enter it again. You would have to restart the race.
If you lagged hard through checkpoints, they would catch up.
0.3
Haven't ever had a checkpoint that I can't drive though, on the second attempt.
Unsure if it's lag, but I drive through checkpoint, then have to reverse/turn around to get the checkpoint.
Falky, gimme a good reason. :p
It over lapped the race leaders. Same with the rims.