Little bit of suggestions

[deBBuu]

Highways
Fire Stations
More clothes
Better ELS system for Police cars, ambulance, etc.
Fire trucks
Breakable structures (Bushesh, TIny trees etc.)
Traffic Vest model
Polish translation of the game
Hide nametags
More animations

[Walkabout]

Fire object (animated)

Fix curbs so cars don't get stuck/damaged

More interiors (Some modder should re-do the town buildings and do so they all can be entered)

More houses in the big city, perhaps apartments. I do know it can be mapped but with all the foliage surrounding the town it's hard to find a clean area

A motorbike (Harley) two seater, could also add a sports bike while we are at it, but a Harley would be useful for many

[Logic_]

A motorbike (Harley) two seater, could also add a sports bike while we are at it, but a Harley would be useful for many

The bikes require completely new physics to work in game as they are two wheeler vehicles. So don't expect to see it very soon :P