We do it on snowmobiles to let on coming riders know whos behind us because sometimes we get sperated on the cornors and its just to let them know.
5 Fingers= 5 or more riders behind me
4 Fingers=4 riders behind you
3 Fingers=3
2 Fingers=2
1=1
Closed hand or 0=none
Might not even be close to what your talking about haha
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