This is not a concern in WA, there's no state highways that have the same number as US or Interstate highways.
-compdude On Thu, Oct 17, 2013 at 10:31 PM, Eric Fischer <[email protected]> wrote: > California gives State, US, and Interstate roads unique signed numbers > within the state, but not all states do. Interstate 64 in southern Indiana > is close enough to State Road 64 to cause frequent confusion. > > Eric > > > On Thu, Oct 17, 2013 at 8:52 PM, Tod Fitch <[email protected]> wrote: > >> On Oct 17, 2013, at 6:11 PM, Nathan Mills wrote: >> >> > On 10/17/2013 1:03 PM, Richard Welty wrote: >> > >> > If my GPS tells me to "turn right at the entrance to East Interstate >> Whatever" and the sign says "North Interstate Whatever," I'm going to be >> confused and wonder if I'm actually making the correct turn. Even more so >> if it's a printed list of directions. >> > >> >> I can't say for the urban auxiliary (three digit) freeways, but the >> single and double digit Interstates all seem to have on ramp signs that use >> their nominal direction rather than the compass direction at that >> particular location. At least that is my understanding from what I've read >> about the rules and conventions that are supposed to be used and I have >> never noticed an exception. >> >> For what it is worth, it is my understanding that within a state the use >> of a particular number, at least outside of triple digit urban beltways and >> penetration Interstates, is supposed to be unique. So if I-10 goes through >> your state, there will be no US10 nor a state highway 10. I haven't paid >> much attention to this in other states I've visited but it seems to hold >> true for California. If true throughout the US then it could be used to >> help validate highway route numbers. >> >> Confusion in California comes in two flavors: In Southern California >> there is a popular tendency to call freeways by a name (e.g. "The Ventura") >> and use the actual direction the road goes for that named segment >> (east/west for the Ventura) when giving directions. But the named segment >> might be on a US or Interstate with a different nominal direction. This bit >> me years ago when we were mailing out wedding directions and I assumed the >> on ramp from the hotel area would be labeled for the eastbound Ventura >> Freeway when, upon checking, it turned out to be labeled for southbound >> US101. >> >> In the San Francisco Bay Area the confusion comes from the fact that the >> only Interstate to enter the area is I-80. So all the urban auxiliary >> (three digit) freeways have to have a suffix of 80 (even number implying >> east/west) even if the road is north/south. So we have 280, 580, 680, 880, >> etc. all going in different directions. Southern California avoids this by >> having I-5, I-8, I-10 and I-15 enter the area, so I-210 is basically >> east/west while I-405 and I-215 are basically north/south. >> >> -Tod >> _______________________________________________ >> Talk-us mailing list >> [email protected] >> https://lists.openstreetmap.org/listinfo/talk-us >> > > > _______________________________________________ > Talk-us mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/talk-us > >
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