In response to
daknife's post (a few posts up):
Number of lanes doesn't say much of anything about the function of a road, especially not in rural areas.
US-31 in Michigan is the only way up and down the western side of the Lower Peninsula, and it's a two-lane highway for much of its length. Don't make it a Major and it won't be used, instead favoring hours-longer and much further routes using I-75. (A thread about it is what inspired me to put this new standard together.)
Yes, a US highway number means you get federal funding. But
why are those roads chosen to get federal funding? Because they are considered by the federal government to be deserving of federal funding, because they are the non-freeway routes used for interstate travel.
The
physical characteristics of a road tells you very little about its
function. A two-lane road is sufficient to carry traffic for very long distances if it's in a rural area. The
biggest difference between Major and Minor, especially in rural areas, is that Major can be used for routes longer than (200 mi? 250 km? something like that).
daknife wrote:Take a look at
this location what is the functional difference between the two roads? They are both built identically, one is part of a US hwy stretching from Canada to Mexico, the other is a State Hwy.
The functional difference is that the US highway can bring you from Canada to Mexico. Routes longer than (200 mi? 250 km? some rather-long value) will only use freeways and major highways.
(I also admit to a slight dislike for the Major type because the color used in the App is too close to the heavy traffic color occasionally making it hard to tell at a glance whether that's a Major hwy ahead or a major traffic jam that I need to avoid.)
I've said it before, the Map Editors scheme should
never be used to consider the general user experience. Only map editors have any reason to use it. I stopped using it over a year ago because it's not indicative of the general user experience.