Cops are just people and the problem is there are good cops and bad cops. Its the bad ones that will turn up, just so they can give everyone the shits and get in the good books with their boss. It also boosts their quota. The only way you will get something like this to work without being bugged by the cops is to do a toy run for homeless kids or sick kids or something like that. The thing i see here is its perfect for the cops, get you all in one spot, no looking for everyone. you will find that a lot of yellows will be given out just to get you off the roads.
sorry but that is how i see this going, Thats my view