Just ran a local 5k. Two kids who ended up running about 16 flat were in front of me, made a turn with their police escort. I was just far enough behind after the two mile mark that I didn't see them make the turn. I went right through it (there was no signage) and got to the next street where a cop was directing traffic. Told me the turn was about a quarter mile back... Needless to say I was a little upset.
PSA - at least put an arrow up for those of us that are fast enough to be running alone but slow enough to not get the police escort. Kthnxbai.