the "not" was actually highlighted, but the effect is not very strong. fixed it now.
And yes, there is no news yet due my lack of time.
I also want to do examples as pictures.
I will try to do all of that on the weekend
Now regarding the definition of a crosroad:
In general a bridge is not a crossroad, but a ... yeah a bridge and the other road is called a tunnel. You should really be able to collide with other cars on a crossroad.
The same counts for the re-use. Cars should be able to collide. And a re-use should consist of more than one block to differ it from a regular crossroad. But it doesn't matter in which direction the cars go while on the re-use. But it is important that the routes cross each other. A "parallel" re-use is not allowed.
For the jump the cars should be within an area of 2 blocks high, too make it not too difficult.
I hope it is a bit clearer now. If not, I'll make pictures on the weekend