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<p>Hi Dave,</p>
<p><br>
</p>
<p>The routing is done by Garmin software, so we don't know all details.</p>
<p>The (old) img format doesn't have much room for details.<br>
</p>
<p>The road-speed and road-class are probably the most important values,</p>
<p>besides the access restrictions. The Garmin algo also calculates angles</p>
<p>at crossings and doesn't like to make sharp turns when in car mode.</p>
<p>For long distance routing in car mode the algo prefers to get on a major</p>
<p>road and use that as long as possible. </p>
<p><br>
</p>
<p>So, in short, a bunch of traffic signals may reduce the avg. speed, but <br>
</p>
<p>my understanding is that this depends much more on the time of the day</p>
<p>(rush hour) . I also don't like the idea that the device routes me through <br>
</p>
<p>rather small roads to avoid a crossing with traffic signals.</p>
<p>I know such a place in my neighbourhood and the "clever" route is used</p>
<p>by many cars, even though it goes through a tempo 30 zone and across <br>
</p>
<p>bumpers. <br>
</p>
<p><br>
</p>
Gerd<br>
<br>
<div style="color: rgb(0, 0, 0);">
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>Von:</b> mkgmap-dev-bounces@lists.mkgmap.org.uk <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von Dave Swarthout <daveswarthout@gmail.com><br>
<b>Gesendet:</b> Montag, 22. Februar 2016 00:56<br>
<b>An:</b> Development list for mkgmap<br>
<b>Betreff:</b> Re: [mkgmap-dev] Option "link pois to ways"</font>
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<div dir="ltr">So, the number of traffic_signals encountered on one route vs another route isn't even a factor in mkgmp routing? I have been adding traffic_signals to my workload for the past year in hopes it would improve routing accuracy. <br>
<br>
How then does routing get calculated? On my Garmin there is a choice for "fastest" vs. "shortest" routes. Usually this choice doesn't make much difference in the overall time involved for a traverse along a route and I always assumed it was because here in
Thailand so few of our highways have maxspeed tags. How are these two routing choices handled by makgmap?
<div><br>
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<div>Sorry for the extra questions but I am curious to know these things.</div>
<div><br>
</div>
<div>Cheers,</div>
<div>Dave</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Mon, Feb 22, 2016 at 12:23 AM, Jakob Mühldorfer <span dir="ltr">
<<a href="mailto:mail@jmuehldorfer.de" target="_blank">mail@jmuehldorfer.de</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex; border-left:1px #ccc solid; padding-left:1ex">
Oh, allright.<br>
Maybe if you have time some day, you could look into it again. I think there are some use cases.<br>
One example where the OSRM traffic light penalty for example seems to have chosen the clever way around the traffic light:<br>
<a href="https://www.openstreetmap.org/directions?engine=osrm_car&route=51.05581%2C13.72190%3B51.05522%2C13.71881#map=19/51.05541/13.72034" rel="noreferrer" target="_blank">https://www.openstreetmap.org/directions?engine=osrm_car&route=51.05581%2C13.72190%3B51.05522%2C13.71881#map=19/51.05541/13.72034</a><br>
<br>
Regards<span class="HOEnZb"><font color="#888888"><br>
Jakob</font></span>
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<br>
Am 21.02.2016 um 18:19 schrieb Gerd Petermann:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex; border-left:1px #ccc solid; padding-left:1ex">
Hi Jakob,<br>
<br>
I think this cannot be done with rules, it requires new java code.<br>
I thought about this a while ago and stoped because I doubted that this<br>
would improve routing.<br>
<br>
Gerd<br>
<br>
________________________________________<br>
Von: <a href="mailto:mkgmap-dev-bounces@lists.mkgmap.org.uk" target="_blank">mkgmap-dev-bounces@lists.mkgmap.org.uk</a> <<a href="mailto:mkgmap-dev-bounces@lists.mkgmap.org.uk" target="_blank">mkgmap-dev-bounces@lists.mkgmap.org.uk</a>> im Auftrag von Jakob
Mühldorfer <<a href="mailto:mail@jmuehldorfer.de" target="_blank">mail@jmuehldorfer.de</a>><br>
Gesendet: Sonntag, 21. Februar 2016 17:59<br>
An: Development list for mkgmap<br>
Betreff: Re: [mkgmap-dev] Option "link pois to ways"<br>
<br>
Hi Gerd,<br>
<br>
this would be the best solution I think.<br>
So far I found a rule that lowers the speed for the complete road with<br>
the traffic light, do you have one that splits it and adds a lower speed<br>
only on a part, like you said?<br>
<br>
Thanks<br>
Jakob<br>
<br>
Am 21.02.2016 um 17:57 schrieb Gerd Petermann:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex; border-left:1px #ccc solid; padding-left:1ex">
Hi Jakob,<br>
<br>
the current code ignores nodes with highway=traffic_signals.<br>
If I got you right you want to split a road maybe 30 m before the node with<br>
highway=traffic_signals and 30 after and set a lower road-speed value for that 60m part?<br>
<br>
Gerd<br>
<br>
<br>
<br>
________________________________________<br>
Von: <a href="mailto:mkgmap-dev-bounces@lists.mkgmap.org.uk" target="_blank">mkgmap-dev-bounces@lists.mkgmap.org.uk</a> <<a href="mailto:mkgmap-dev-bounces@lists.mkgmap.org.uk" target="_blank">mkgmap-dev-bounces@lists.mkgmap.org.uk</a>> im Auftrag von Jakob
Mühldorfer <<a href="mailto:mail@jmuehldorfer.de" target="_blank">mail@jmuehldorfer.de</a>><br>
Gesendet: Sonntag, 21. Februar 2016 17:31<br>
An: Development list for mkgmap<br>
Betreff: [mkgmap-dev] Option "link pois to ways"<br>
<br>
Hi,<br>
<br>
one more question I was not able to figure out from documentation or source.<br>
When the option "link pois to ways" is used, does it automatically<br>
process traffic signals in a way that adds a time penalty for routing<br>
through them in the map data.<br>
<br>
Thanks for help on that<br>
Jakob<br>
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-- <br>
<div class="gmail_signature">
<div dir="ltr">Dave Swarthout<br>
Homer, Alaska<br>
Chiang Mai, Thailand<br>
Travel Blog at <a href="http://dswarthout.blogspot.com" target="_blank">http://dswarthout.blogspot.com</a></div>
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