The term 'Expressway Entrance' can be broken down into two parts: 'RAMP' and 'Onramp'. A RAMP is a sloped road that connects two different levels of a highway, allowing vehicles to transition from one level to the other. An onramp is a section of a highway that allows vehicles to enter the expressway from a lower-level road. Together, these two components form an expressway entrance, which provides access to the expressway for vehicles.