There are a few mods to reduce the amount of taxis/police cars and probably duplicate cars too
I'd say give any of those a try.. just google taxibug fix. When using those fixes make sure you turn down your traffic density to 20 or lower (or else they'll have little effect).
but tbh at best you'll be able to reduce the amount, you'll never get rid of the problem entirely
Last edited by Killerfist; 02-16-2014 at 02:26 PM..