Well, here are answers to some of your questions.
1). Will it be possible to go out the road and to hit a bush for example?
Yes, but not everywhere. The Californian freeways are fenced to avoid the trespassing of animals.
2). Are the cities in the gimilar to the real ones. What about downtowns?
Well, mostly the cities are represented along the main roads, so if a main road goes through a downtown (e.g. Los Angeles, San Francisco, San Diego), the downtown is represented in details.
3). The railways question.
Well, there will be trains and trams, but they don't cross the roads (as in the real life speaking of the roads presented in the game.)
4). Will the charecter be able to sleep?
Well, you won't be able to sleep, but you just can take a rest.
5). Demo question.
The demo isn't planned.
6). Can the school buses pick up the kids at the stops?
No, they cant.
7). Will the multiplayer be included in an addon?
We can't tell you now, but we'll inform about it as soon as ossible.
. The in-game sounds trailer question.
The release of such trailer is possible, but we can't tell you the date of its release now and will inform you about it as soon as possible.
9). Will we be able to save the game at any time?
Yes, you will.