Interstate Access is a term used to describe the ability to access an interstate highway. The term can be broken down into three parts: RAMP (4 letters), Onramp (6 letters), and Fwayonramp (10 letters). A RAMP is a roadway that connects two highways, usually at different levels. An onramp is a RAMP that allows vehicles to enter an interstate highway from a local road. Finally, a fwayonramp is a RAMP that allows vehicles to enter an interstate highway from another interstate highway.