The two most important reasons for using mirrors when merging into traffic are?

Question

Quizplus · Accepted Answer

The two most important reasons for using mirrors when merging into traffic are to ensure that the gap you plan to slip into is large enough for your vehicle and to get a sense of the speed that it will take for you to merge safely. Both of these are extremely important when merging into traffic, especially interstate traffic. While it is always good to know if you are being tailgated, your first priority when merging into traffic is to do so safely.

The Two Most Important Reasons for Using Mirrors When Merging