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Question:

To enter an interstate highway, use the acceleration lane to _________ until your vehicle's speed matches that of highway traffic.

A increase your speed
Explaination

To enter an interstate highway or some other expressway, use the acceleration lane to speed up until your vehicle's speed matches that of highway traffic. Then merge safely. If you try to merge while you're still driving too slowly, you may obstruct highway traffic or even risk a rear-end collision.