 So we can all agree we're not great at it. And I did find out a pretty convincing reason why. According to the Department of Vehicle Services, zipper merging wasn't added to the driver's manual until 2015. So if we assume that most Minnesotans take driver's ed at age 14, that means Minnesotans above the age of 23 were never formally taught how to zipper merge. And that means the majority of drivers on the road were never taught.