3D Traffic situational simulation.

Hi there, I need a 3D model done (low poly with simple colors/textures) for a traffic situation simulation. What I mean by that is... There will be a structure sent to you which shows a basic idea of 2 parallel roads with 2 or 3 intersections each. (point 1) Each section of the road will have a different "situation" like 1 would be an accident, 1 would be a broken bridge, and 1 would be rainy/wet roads. (point 2) Then it should have cars moving, and stopping when they reach this danger point. (point 3) It should be a very basic outline type of project, with very low poly counts. (point 4) It should convey the general idea of each object/image. Keep in mind that it will have some kind of scenery, as in, a river, lake, trees, some buildings, and most importantly a few signal towers. (point 5) Also, I personally use Unity 3D to code in some things, and maybe change/edit/move these models in a way I want. (point 6) Therefore, please be sure to make it compatible to be imported using *.obj or *.3ds (i prefer *.obj) And make sure to use "levels/layers" of each model/item. That way I can edit different parts as I need to later on. THE DIFFICULT PART: (point 7) This may be the most difficult part, so please pay attention to this: I will do this part on my own, but I need you to understand what I will do, so that you can make your models compatible for what I'll do. Some of the car models, I will make them send a "signal" like a "message" to other cars. So I want to be able to move the camera, showing 1 accident or problem, and then move the camera again into the car to show the message displayed on the front window (windshield window). Why am I telling you this? So you could make your models compatible for such things that I'll do to them :) Please reply with any questions you have on any point. And set your price. P.S: I need someone who is FLEXIBLE and capable of changing things during the work process, and not ask for "more" just for simple changes. For example, if I want you to change something like the scale of an object, or lower the details of something, or change how you designed the tower... etc. *By making a bid, you agree to this part and understand the project as a whole, as you will work with me (the programmer) to make this project fully functional - therefore, we must keep clear communication and "CONSTANT" communication via any method you prefer.*