Its wheels touched the bumpy surface of a grassy field.

The circuit is known for its bumpy surface.

The brakes adjust, up or down, for smooth or bumpy surfaces.

"If it's a bumpy surface, you're going to lose traction and not get the power to the ground."

However, various factors can cause it to dry into a bumpy surface resembling the texture of an orange peel.

And the Rocket 3's set-up works well even on bumpy surfaces.

The relatively large leaves have a bumpy surface and irregular margins.

We were in his car, driving over the bumpy surface of the Queensboro Bridge.

I ran a thumb absently over the bumpy surface of the corn dodger.

It is a flat oval shape with a bumpy surface.