Travel Mapping

Highway Data Discussion => Updates to Highway Data => Solved Highway data updates => Topic started by: Nagamasa on May 10, 2025, 06:47:09 am

Title: What is the system, usansf?
Post by: Nagamasa on May 10, 2025, 06:47:09 am

https://travelmapping.net/user/system.php?units=miles&sys=usansf

I can't figure out the significance of it to have 1 route in this production system.

Title: Re: What is the system, usansf?
Post by: Markkos1992 on May 10, 2025, 07:30:32 am

It was to include some freeways in states in which their state route system was not active yet.  This system will go away once usams, which covers all of the Mississippi  State Highways, is active.

The system usadc is active with one route (DC 295), but that is purposeful as DC 295 is the only DC route.

Title: Re: What is the system, usansf?
Post by: vdeane on May 10, 2025, 04:01:33 pm

To add, usansf is a relic from the early CHM (Clinched Highway Mapping) days when full state route systems weren't a thing yet.  The freeways came first, and then as more states got their state route systems done, the size of the system shrunk.  This was even more important back then, because there wasn't a distinction between "preview" and "devel" on CHM - just "active" and "in development".  Preview was added after TM replaced CHM.

Title: Re: What is the system, usansf?
Post by: Nagamasa on May 12, 2025, 10:05:54 pm

Cool! Thanks for the context, makes more sense now.