Adding on to what CFD said, we are looking at basically creating realistic scenarios for their respective areas. Industrial incidents might have Hazmat incidents and the Highways might have car crashes and car fires.
Thats what we plan on doing anyway, it might change as everything usually does.
You should really try to stick to that idea though. It would be nice if we could see a difference in areas such as residential and commercial. In addition having chemical fires would be nice because I think the hazardous units rarely get used as it stands.