is it possible to make an adjust block?, because most of my roads are tilted, and my car drives straight through them. could somebody show me the script for defining that?

Could you clarify? Do you want to change the direction of your roads in the project?

I mean, when I drive it, it doesn't keep its tires on the ground, it goes right through the ground. Let's say my ground is tilted, and make of 3 tiles, like this .
_-`. when my car lands on the first tile, it drives right through the second tile, instead of adjust to the ground sprite.

I think I know what you mean. What you need is a script that tells your sprite to move up if it is touching terrain, and move down if not. This project uses that method to make a similar game.

http://scratch.mit.edu/projects/2777552/