A feature I mentioned earlier now has a preliminary implementation. Highway systems now have a third option between "active" and "in-development" called "preview". Systems denoted as preview are those that are intended to be complete but awaiting review and (hopefully) only minor fixes before activation. In the normal logs and maps, they continue to be treated the same as before. However, a second instance of the database is populated as if the preview systems are active rather than in-development, so they show up on maps (and soon perhaps in an alternate per-user log file).
For now, the only place that honors the new option is the draft map overlay viewer. Include preview systems in maps by specifying the alternate DB's name as a query string parameter. For example, to see my NM travels with the usanm "preview" system included, you would use:
http://tm.teresco.org/hbtest/mapview.php?rg=NM&db=TravelMappingDev&u=terescojAlong with many of the other features, I expect and intend that these query string parameters would be generated automatically by some nice front-end web pages some day. For now, it's a good way for those who submit .lists to find mistakes and omissions in the preview systems before they go active, and for highway data managers to see the routes and hopefully also find mistakes before activation.
Important note: updates entries will not be made for changes to systems in preview status, so users should expect things to "break" their list files until those systems are deemed ready to be moved to full active status.
So far, I picked the following as the systems I thought were intended to be substantially complete and worthy of the "preview" status: usavt, usanm, usaco, usava, usawy, usain, usamt. I expect some of the systems in Canada and outside of North America will soon be added to the preview set at the discretion of the highway data developers.
Enjoy! (and please let me know if anything appears to have been broken by this.)