While we generally shy away from unsigned routes, Oregon's dual systems presents an odd situation.
Back in 2002, ODOT and the Oregon Traffic Commission decided to sign the Highways that didn't have Route numbers because the general public was well aware of the dual system and the confusion that would occasionally present itself. A good number have been signed. A good number... still have yet to be signed, but with the intention that they all be signed, they were included in the Routes set anyway back when CHM branched into the state highway sets.
The Oregon Highway (ORH) set is meant to reconcile this, as well as mapping the deviations that occur on the longer highways. Some are very straightforward - I-5 is ORH 1. US 101 is ORH 9.
Others aren't. I-84 is ORH 2 and ORH 6; ORH 2 is I-84 and US 730. US 26 is ORH 47, 26, 53, 360, 41, and 5. ORH 47 is US 26 and the Market/Clay couplet downtown Portland (formerly US 26). ORH 26 is US 26 and OR 35. ORH 53 is wholly US 26, as is ORH 360. ORH 41 is OR 126 and US 26. ORH 5 is OR 19 and US 26.
As noted, some Highways still don't (or won't) have signed Routes. ORH 420 in Klamath Falls is one, because ODOT is looking at turning it over to Klamath County and Klamath Falls. ORH 1W over Barbur Blvd, Naito Pkwy, and Interstate Avenue in Portland is another, because Portland now maintains the route (despite the odd OR 99W shield on the OR 10 overlap). (Why include this one then? It still appears in ODOT maps, notably odd segments in Delta Park, over the Steel Bridge, and the OR 10 segment. For the sake of simplicity, it's being treated as a continuous segment; ODOT, the OTC, and PBOT would be smart to put up His US 99W shields to put the issue to rest, IMO).
Some Routes might not have underlying Highways. US 26 through the Ross Island Maze is such an example, as ORH 26 begins at Naito Pkwy, not at 6th and Broadway at I-405. OR 18 on the Newberg-Dundee Bypass might be such a case, though I doubt that one.
Does this add mileage or is this wholly a redundant system? Even if every Highway were signed as intended, yes, this will add mileage.
Do we really want a system for 'hidden' highways? It's enough in the public knowledge that it spurred ODOT and the OTC to get signage out. And also, Gotta Clinch 'em All.
How does this affect my progress in updating the Interstate, US, and OR sets? Updating those Routes has generated enough in-tandem Highway .wpts to put this into Devel status. While there are certainly quite a few Routes to finish (along side high-numbered US and I routes), by the time they are finished, so will be the Highway set ready for Preview.
Yeah, but, do we really need this set? I'll leave that for discussion amongst the colleagues. I myself think it's worthy.
Ok, so what are the datasources? Same as for the Routes, along with directly asking ODOT staff personnel via email (such as when clarifying the OR 39 southern terminus issue that Oscar came across), and a
handy list of Highways to Routes cross-reference.
Because the highway name is just as important as the number in this set, I've set up the .csv as such:
System;Region;Route;SignedRoutes;ConcurrentRoutes;City;Filename root;AltRouteNames
usaorh;OR;ORH1;I-5;OR 99,OR 138,OR 99E,US 30;;or.orh001;Pacific Highway (Baldock Freeway, Eastbank Freeway, Minnesota Avenue)
usaorh;OR;ORH1E;OR 99E;;;or.or001e;Pacific Highway East
usaorh;OR;ORH1W;OR 99,OR 99W;OR 126B,OR 18,OR 10;;or.or001w;Pacific Highway West
usaorh;OR;ORH2W;US 30;;;or.orh002w;Lower Columbia River Highway
usaorh;OR;ORH2;I-84,US 730;US 30,US 395;;or.orh002;Columbia River Highway (Banfield Freeway)
usaorh;OR;ORH3;OR 43;;;or.orh003;Oswego Highway
usaorh;OR;ORH4;US 197,US 97;US 26;;or.orh004;The Dalles-California Highway
usaorh;OR;ORH4Y;US 97;Bus;Bend;or.orh004yben;3rd Street Spur
usaorh;OR;ORH5;OR 19,US 26;;;or.orh005;John Day Highway
usaorh;OR;ORH6;I-84;US 30;;or.orh006;Old Oregon Trail
usaorh;OR;ORH7;US 20;US 26,OR 201;;or.orh007;Central Oregon Highway
usaorh;OR;ORH8;OR 11;;;or.orh008;Oregon-Washington Highway
usaorh;OR;ORH9;US 101;;;or.orh009;Oregon Coast Highway
usaorh;OR;ORH10;OR 82;;;or.orh010;Wallowa Lake Highway
with the intention that the HB for a particular highway will show the ORH xx shield, the OR/I/US yy shield alongside, the concurrent Route shields on the next line, and on the third line, the Highway's name.
I don't know if that's possible, but I'd like to find a solution if it isn't.