Walldriving Stunt #1 - Behind the Freeway Wall (I)
If you want to learn the art of walldriving, this is a nice way to start. You start at Chinatown and then drive down to the freeway.
Before you slam into the wall you pull right and walldrive.
When everything goes ok you will start flying and fly over the freeway wall.
From here you can drive along the highway, but eventually you will always end up at the sea. If you want to go back, just drive against the wall you will go right through it.