What is the main way to gain access to an expressway?

The primary way to gain access to an expressway is through an entrance ramp. Entrance ramps are specifically designed to allow vehicles to enter the expressway safely and efficiently. They provide a gradual incline that allows drivers to accelerate to the appropriate speed before merging into expressway traffic. This design promotes a smooth transition from slower-moving roads to higher-speed expressway lanes, reducing the risk of accidents during the merging process.

In contrast, highways are broader road systems that may include various types of vehicles but do not specifically indicate the access point to an expressway. Two-lane and one-lane roadways refer to the number of lanes available for traffic but do not imply any direct access to an expressway, as they may lead to local roads or other types of thoroughfares rather than providing a means to enter higher-speed traffic flow. Thus, the entrance ramp is the most direct and appropriate method for entering an expressway.