Here's my list of possible features/inclusions.

- Traffic Light Support
- Drunk Drivers
>>>>> Random numbers equal random actions
- Crash severity meter
- Output in both raw data and interpretable data
- Possible distributed computing/parallel processing support

Add on, d00ds.

 
http://www.ce.berkeley.edu/~daganzo/publications.html - A MASSIVE index of publications on traffic flow. I haven't read thru all of these yet, however.
http://www.first.gmd.de/applications/heiko/heiko.html - What sort of data you need to do a good traffic simulation--Not to big of a site.

 
Testing.

 
This is merely a test! :)