The name of the walk that models do on a runway is called a runway walk. Although it is sometimes called a ramp walk also.

when you start the level, go to the building that has a vert like ramp hanging near the entrance (the building is blue). Do you best to get up there, but you have to grind when you reach it. keep grinding on the ramp, and you should see the kid special. keep grinding until you get it.

One example of a ramp is a wheelchair ramp.

This is called an "entrance ramp" on "on-ramp" or simply a ramp, because the off-ramp is more typically called an exit.

An Egyptian ramp is a ramp with a platform in the middle to reduce the incline of the ramp and/or to change the direction of incline.