What Vic is doing is out of the ordinary (at least it is these days). That gets the attention of the riders who overtake him and they may start to wonder if they are missing something (like maybe Vic is a cop). Just in case, they likely then decide to play along until things return to normal (they're on their own).
That's just my wild guess. Once again, we need to check in with the NSA and find out exactly what the other riders are thinking.