On Wed, Apr 29, 2015 at 2:53 PM, Ilpo Järvinen <ilpo.jarvi...@helsinki.fi> wrote:
> On Wed, 29 Apr 2015, Paul Johnson wrote: > > > On Wed, Apr 29, 2015 at 1:58 PM, john whelan <jwhelan0...@gmail.com> > wrote: > > The difficulty is in many cities traffic lights are synchronised > > in such a way that cars may have to stop at the first but there > > after if they are travelling at or close to the speed limit they > > will not be stopped on subsequent sets of lights when travelling > > in a straight line. ie there is no penalty. > > > > I would love to know if there's a tagging schema to hint at which > direction > > the green wave rolls on a street. Tulsa is somewhat notorious for > > reintroducing two-way traffic on streets timed for one-way, effectively > > creating a "red wave" in the direction opposite the street's previous > > one-way direction. There's quite a few around work and I dogfood the > map on > > routine trips to find hangups. Ideally, the "red wave" direction would > be > > penalized severely for cars and bicycles, and incentivized for > pedestrians > > (since walking the direction as the motorist's red wave usually produces > a > > pedestrian green wave (or very near to it) by coincidence in many > cities). > > One would have to account also time of the day/weekday/holidays etc. which > might affect the scheduling of the traffic signals. They run with > different programs at different times of day. Tracking all those by survey > alone might turn out rather time consuming and error-prone, however, if > one can get the traffic light management departments to open up their > timing data it might be very useful for this. > For the sake of sanity, let's assume that we're talking traffic lights that are either always on a timed pattern, which should also be reasonable for signals that go to two or four way stops at night (and possibly during a natural disaster). This should reasonably handle normal operation of the signals (even in Portland, which often has traffic lights skip a signal to hold motorists, bicycles and sometimes even pedestrians to prevent a conflicting movement with trams and streetcars). The idea for this concept would be to provide some hint that, under the usual set of circumstances, going a specific direction on a two way street is going to really hurt.
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