Beta Altitude 1.5

This is the official released version.
The loop around the mountain is closed, 12 km of asphalt road and 6 km of dirt road.

* Improvements since v0.7 :
- Add escapes for jumps.
- Add 6 km of asphalt road with cliffs and tunels.
- Add 2.5 km of dirt road in forest.
- Add an arena.
- Add a surprise end of the track!
- Ambient sound modified.

* known problems :
- AI don't corss bridges and tunels.
- Some glitch or bugs between objects and terrain, sometime on roads.
- Framerate down.

High config computer without dynamic reflection is advisable. Please don't review this map about framerate , I have passed a long time to surch and test some issues to optimised this map without results , this problem is beyond my expertise... I CAN'T HAVE THIS RENDER OF THE MAP AND GOOD FPS WITH MY KNOWLEDGE. SORRY