I have problem with gangs

MAP_ZONE name_zone = ( car_total , good_cars, bad_cars , police_cars , ped_total , pickpockets , car_thiefs , elvis_chains, gang_members , cops , gang_cars )
I have
MAP_ZONE gangzone = ( 1000 , 0, 0 , 0 , 1000 , 0 , 0 , 0, 1000 , 0 , 1000 )
but still on this zone dont see gangsters cars ;] I dont see nothing cars now

WhY?