[admantis]

pawn Код:

stock GetClosestVehicle(playerid)
{
    #pragma unused playerid
    new Float:x, Float:y, Float:z;
    new Float:dist, Float:closedist=9999, closeveh;
    for(new i=1; i < MAX_VEHICLES; i++)
    {
        if(GetVehiclePos(i, x, y, z))
        {
            dist = GetPlayerDistanceFromPoint(playerid, x, y, z);
            if(dist < closedist)
            {
                closedist = dist;
                closeveh = i;
            }
        }
    }
    return closeveh;
}

removing 'playerid' might make it all obsolete, it doesn't make sence. Get the closest vehicle, from who?