On Mon, Sep 10, 2018 at 2:38 PM Paul Johnson <ba...@ursamundi.org> wrote: > > I see it as a variation on no turn on red/turn after stop OK on red > dichotomy. Not really significant enough to bring up in the map data > specifically, so long as the signal itself is mapped. And the single white > line seems to not be of special significance in most cases, only meaning that > you need to use additional caution when changing lanes (as opposed to double > white lines, where lane changes in one or both directions is prohibited).
For what it's worth, New York appears to have used a double broken white line to separate climbing lanes. (Source: personal observation in the field.) The drivers' manual does not discuss this unusual marking. There is a subtle difference in the signage. The signs read "SLOWER MOVING TRAFFIC KEEP RIGHT" for a climbing lane vs "KEEP RIGHT EXCEPT TO PASS" for a 'normal' multilane road. The implication appears to be that you don't have to move to the right into a climbing lane if nobody is overtaking. The double-broken-white-line convention last appeared in the 2005 NY State MUTCD. There's a 2015 order https://www.dot.ny.gov/divisions/operating/oom/transportation-systems/repository/TSMI-15-02.pdf that prohibits the practice, and uses broken, solid, and double white lines to indicate that lane crossings are permitted, discouraged or prohibited respectively - in conformance with the federal MUTCD. Nevertheless, there are a fair number of roads that have not been restriped and still bear the old double-broken-line convention. Restriping projects in some cases appear not to have removed the old paint, giving rise to a broken white line that is unusually wide. MUTCD permits painting wider lines than standard, for emphasis. New York uses the wide lines to set off dedicated lanes (HUV lanes, turning lanes, merge/exit lanes, or lanes committing the driver to one side of a route split.) https://www.dot.ny.gov/main/business-center/engineering/cadd-info/drawings/standard-sheets-us-repository/685-01_082718.pdf There were also once some lanes that were set off with white partial-barrier lines (broken and solid line in parallel), which appeared to allow merging into a climbing lane but forbid leaving one once committed to it. These are also forbidden under the 2015 order. A 90%-good solution to all of these combinations is simply to indicate the number of forward, backward and both_ways lanes. Some of the finer details fall into "Don't map your local legislation' _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
