A Fall Trip through New England: Part 2

One fact we quickly learned while driving around New England is that most highways here don’t have their exit numbers tied to mile markers. What is that about? Every other part of the US we've visited so far has followed this golden rule, why not here? In case you’re not familiar with what I’m talking about: most highways in the US tie their exit numbers to miles traveled on that highway, so for example, if you entered the highway just past exit 20, and went 40 miles, you’re going to be looking to get off on exit 60. This makes so much sense! Here we get on the highway around exit 10, and our directions say to get off on exit 14, and we go 50 miles in between. What happens when they need to add a new exit in between 10 and 11? Is that how we get 10a, 10b and 10c? Yuck!