And then we FINALY got started on the antiblock system (thanks Vincent) so at first we thought of putting some form of triangle like thing on the front(as shown below) but we scraped that idea in the end because Vincent came up with a much more logical idea, of just inversing the polarity of the motor by flipping a switch which would be linked to a polarity inverser which in turn would be linked to the motor and the solar panel. We started with some sketches:

Then we realised that we were going to have to weld some cable to the actual switch. And for those who were wondering this is how did it:

 

And in the end it looked like this:

And for any sceptics out there it does work!(insert video)

We still had to figure out a way to fix the switch to the rover and a way to flip the switch when it did eventually hit the wall. this is what we came up with:

Yes those are cocktail sticks!
What actually happens is the cocktail sticks will hit the wall and flip the switch which is cunningly put trough the cocktail sticks hole. We did put a second cock tail stick in the opposite direction so that the rover can hit a wall one way and then hit another and jus t go back the other way and can now do that for the rest of eternity.
And we decided that this was probably the best system:

So what we did was put the system you saw above (+the second cocktail stick) through the midle of the rover