Answer:So that drivers can reach the proper speed before blending with traffic.
Explanation: An expressway is a road in which the two directions of traffic are separated by a central barrier or strip of land where intersections and direct access to adjacent properties have been eliminated. Essentially, an expressway has 3 entrance lanes which are the entrance ramp, the acceleration lane, and the merge area.
The acceleration lane is the lane whereby a motorist moves faster in order to blend to the proper speed of the expressway.