I've also been researching this with some local traffic engineers / road fans. There are still instances of this sign being posted, mostly on dirt roads where the DOT does not want tracked vehicles like bulldozers--or tanks--to drive them.
That said, I don't see an applicable access restriction for tracked vehicles on the OSM access tagging list. On Wed, Dec 2, 2015 at 1:35 AM Greg Morgan <dr.kludge...@gmail.com> wrote: > On Tue, Dec 1, 2015 at 8:45 AM, Harald Kliems <kli...@gmail.com> wrote: > >> Very useful, Simon. Thanks! >> >> Slightly OT: Can anybody explain what R5-5, "No vehicles with lugs" >> means? I'm assuming it doesn't refer to vehicles like this >> http://3.bp.blogspot.com/_MyBrrEGexIg/TEIogw5nrdI/AAAAAAAAAFk/Jl7SF5tfQV0/s1600/L9990154.JPG >> >> >> >>> > You made me look... > > In the early years of the 20th century, hard-surface roads often had signs > that read: “Tractors with Lugs Prohibited.” > > Those early tractors were built with steel wheels covered with piercing > lugs that gouged every surface. I remember the signs on U.S. 63 south of > Stewartville to Racine and then on Minnesota Highway 16 going west to Grand > Meadow. > > By the late 1930s, tractors finally were being built with rubber tires > that still gave field traction and speed, sometimes up to 20 mph on the > road. > > ... > > > http://www.postbulletin.com/news/local/tractors-with-lugs-were-dangerous/article_580aa04a-5d73-5de1-8139-7b402a63ba90.html > > > _______________________________________________ > Talk-us mailing list > Talk-us@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk-us > -- Elliott Plack http://elliottplack.me
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