Expressways have "expressway entrance lanes" (acceleration lanes) so that drivers can:
test their brakes before driving at expressway speed
stop at the end to wait for a traffic opening
reach the proper speed before blending with traffic
test the pick up of their cars

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.

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