Which term describes the frictional property of Open Graded Friction Course?

• A. Friction
• B. Open surface
• C. Binding
• D. Cryogenic

Answer: (A)

Friction is the key idea here. It describes how resistant the road surface is to sliding under a tire. Open Graded Friction Course is designed with a rough, open-structured surface that helps maintain good grip by promoting texture and drainage, which keeps tire-road contact effective in both dry and wet conditions. That frictional property—how well the surface resists sliding—is what OGFC aims to optimize.

The other terms don’t describe this property: an open surface refers to the porosity of the texture rather than the resistance to sliding; binding relates to how well the asphalt binder sticks the aggregate together, not the interaction at the tire-road interface; cryogenic has to do with extremely low temperatures and is unrelated to pavement friction.