[Dziugsas]

Its very hard unless you do something like this

pawn Код:

new CopCar[11];

public OnPlayerEnterVehicle(playerid, vehicleid, ispassenger)
{
    for(new v;v < 11;v++)
    {
        if(vehicleid == CopCar[v])
        {
            SendClientMessage(playerid,-1,"You have entered a police vehicle.");
        }
    }
    return 1;
}

its just a concept how it should look.