Background Traffic Noise Reduction

Hello all,
I'm currently editing my short film and I have huge issues with background traffic. I've faught with Adobe Audition for about 2 hours now and I can't get a good reduction on my background traffic. I've used adaptive noise reduction and Noise reduction (Process) and I just can't seem to get a decent reduction without having weird noises that would just make everything worse.
If you want you can listen to it for yourself, I'm linking it with dropbox.The beginning is the worst I have plenty of other audio that has more backgrounf traffic.
Thank you in advance for you help! Cheers!

I couldn't find a link to your Drop Box but I can make a few general comments.
First, traffic noise is going to be very difficult to work on because it's constantly changing.  Noise reduction is most effective on things like electronic hiss or an air conditioner running continuously in the background.
However, to give yourself the best chance, use the Noise Reduction (Process) version.  Grab a sample of the background noise but don't try to get rid of all the noise at once.  Do a very light reduction, grab another noise sample, then do another light process.  Keep this up until you hit the best compromise between background noise and the sort of artefacts you've noticed.  Depending on exactly what the noise is, you may find that increasing the FFT size helps.
Because the background will be constantly changing, you MAY find you get better results by breaking it up into smaller chunks with more similar noise problems....general traffic is different from a passing bus.
Which leads me to a final suggestion...if certain noises are a fairly specific frequency, instead of using NR, you might try to go to spectral view and use the marquee tool to draw around the offending frequency and either just hit delete or maybe the spot healing tool.  This'll only work with a narrow frequency band--I was once able to remove a passing ambulance siren almost totally using this method--but a passing truck rumbling through a wide range of frequencies wouldn't really work.
Finally, you might find that some subtle boost in the fundamental voice frequencies might help your intelligibility a bit.  You'll have to play with frequencies to find the right ones but they'll be in the mids somewhere.

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