Moving Cars in source sdk (Help Needed)

I need help with making cars move like on the map DM _bridge where the cars are moving and you can get killed by them!

Here is a link to the map im talking about: DM BRIDGE: http://www.garrysmod.org/downloads/?a=view&id=4128

http://www.halfwit-2.com/?page=tutorials&id=42

Same principle, just switch the models around.