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Route ignores obvious left turn

Scheduled Pinned Locked Moved [Web] Problems, Bugs and other Issues
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    twinfan
    wrote on 3 Feb 2025, 23:19 last edited by
    #1

    Greetings,

    I am a seasoned Garmin BaseCamp/Zumo XT user but just started with MRA using a Basic account. I did this in order to generate routes while on a trip using my iPad if for some reason my original plans change. This happened last fall when our route took us into areas with heavy forest fire smoke. We canceled our original trip plans and headed the other direction. I created new routes directly on the Zumo which was cumbersome to say the least. I like what I'm seeing so far with MRA and can envision moving to it exclusively as I get more experience with it.

    I created a day trip on my iPad and found a situation where MRA would not follow the obvious road. Even when I added shaping points (locations shown by red dots between shaping points 5 and 6) it created convoluted paths to get to them but not follow the simplest, most direct route. It doesn't seem likely this is a map choice problem, that is the free OSM vs. the subscription HERE map. Could it just be an error in the OSM map? My only avoidance is unpaved roads. BTW, this route loaded into the Zumo makes the correct turn as you would expect between the two shaping points.
    Tom

    alt text

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      Mopetenpit
      wrote on 4 Feb 2025, 10:15 last edited by
      #2

      This seems to be a problem with the OSM map. If I change the standard map from OSM to Here or Tomtom, the route works as expected. However, changing from OSM to Here/Tomtom is only possible in the Gold version.

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        Next Stop
        wrote on 4 Feb 2025, 10:25 last edited by
        #3

        As @Mopetenpit said, the Here maps seems to work fine, so presume it's an issue with OSM

        f8973718-a469-4219-af96-b6112485fa50-image.png

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          Martin Wilcke
          wrote on 4 Feb 2025, 14:03 last edited by
          #4

          I don't think it's because of the OSM data.

          There are two potential limitations: A railway barrier and a U-turn restriction, but neither should prevent a left turn:

          OSM-1.jpg

          Other planning programmes based on OSM allow this:

          OSM-2.jpg

          This is probably due to the route engine (API) MRA uses.

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            twinfan
            wrote on 4 Feb 2025, 15:56 last edited by
            #5

            Thanks all for the quick replies. A map problem was my conclusion, too. I've made that left turn many times and there are no restrictions.

            Is there a means to report this problem? In the past I've done so with Garmin's maps.

            Tom

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              twinfan
              wrote on 4 Feb 2025, 17:33 last edited by
              #6

              Answered this last question by creating an OSM account and posting a note at that location.

              undefined 1 Reply Last reply 4 Feb 2025, 17:41
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              • undefined twinfan
                4 Feb 2025, 17:33

                Answered this last question by creating an OSM account and posting a note at that location.

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                Martin Wilcke
                wrote on 4 Feb 2025, 17:41 last edited by
                #7

                @twinfan said in Route ignores obvious left turn:

                posting a note at that location.

                What exactly do you mean by that?

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                  twinfan
                  wrote on 4 Feb 2025, 19:11 last edited by
                  #8

                  OSM provides for problem reporting and map fixes. I made this note:

                  alt text

                  undefined 1 Reply Last reply 4 Feb 2025, 20:55
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                  • undefined twinfan
                    4 Feb 2025, 19:11

                    OSM provides for problem reporting and map fixes. I made this note:

                    alt text

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                    Martin Wilcke
                    wrote on 4 Feb 2025, 20:55 last edited by
                    #9

                    @twinfan said in Route ignores obvious left turn:

                    OSM provides for problem reporting and map fixes.

                    I know. But what exactly causes the problem, in your opinion, and what should be changed or corrected?
                    As mentioned above, other planners based on OSM allow a left turn, so it's not an OSM Map issue. Do you disagree?

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                      twinfan
                      wrote on 4 Feb 2025, 23:55 last edited by
                      #10

                      @Martin-Wilcke said in Route ignores obvious left turn:

                      I know. But what exactly causes the problem, in your opinion, and what should be changed or corrected?
                      As mentioned above, other planners based on OSM allow a left turn, so it's not an OSM Map issue. Do you disagree?

                      From what I read in the earlier posts the HERE and TomTom maps route correctly when selected. So does the Garmin City Navigator North America NT 2025.2 map on my Zumo XT. I think it is a problem with the OSM map but I have no idea how one would fix it.

                      undefined 1 Reply Last reply 8 Feb 2025, 17:45
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                      • undefined twinfan
                        4 Feb 2025, 23:55

                        @Martin-Wilcke said in Route ignores obvious left turn:

                        I know. But what exactly causes the problem, in your opinion, and what should be changed or corrected?
                        As mentioned above, other planners based on OSM allow a left turn, so it's not an OSM Map issue. Do you disagree?

                        From what I read in the earlier posts the HERE and TomTom maps route correctly when selected. So does the Garmin City Navigator North America NT 2025.2 map on my Zumo XT. I think it is a problem with the OSM map but I have no idea how one would fix it.

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                        Martin Wilcke
                        wrote on 8 Feb 2025, 17:45 last edited by
                        #11

                        @twinfan said in Route ignores obvious left turn:

                        I think it is a problem with the OSM map but I have no idea how one would fix it.

                        I have taken a closer look at this spot.

                        The issue is probably caused by an extra barrier:lift_gate entry in addition to the railway:level_crossing. In my opinion, this is wrong.

                        I've added this to your comment, let's see if a mapper with local knowledge makes a change there.

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                          twinfan
                          wrote on 8 Feb 2025, 18:45 last edited by
                          #12

                          Thank you, @Martin-Wilcke . I was contemplating learning more about OSM editing but it is very complex and I wouldn't want to make things worse.

                          undefined 1 Reply Last reply 9 Feb 2025, 19:56
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                            twinfan
                            wrote on 8 Feb 2025, 21:26 last edited by
                            #13

                            I also thought it odd that there were signals shown in only three of the four corners but, then again, I don't understand the mapping "language."

                            ![alt text](e15f6f5e-9fe8-4731-a067-62de0d06c9ae-image.png image url)

                            undefined 1 Reply Last reply 9 Feb 2025, 12:15
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                            • undefined twinfan
                              8 Feb 2025, 21:26

                              I also thought it odd that there were signals shown in only three of the four corners but, then again, I don't understand the mapping "language."

                              ![alt text](e15f6f5e-9fe8-4731-a067-62de0d06c9ae-image.png image url)

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                              Martin Wilcke
                              wrote on 9 Feb 2025, 12:15 last edited by Martin Wilcke 2 Sept 2025, 12:15
                              #14

                              @twinfan said in Route ignores obvious left turn:

                              I don't understand the mapping "language."

                              Here is an overview of all valid keys, their values, meaning and examples:

                              https://wiki.openstreetmap.org/wiki/Map_features

                              Search for railway:level_crossing and barrier:lift_gate; these are the key types related to this issue.

                              It is worth familiarising yourself with the different categories because there is an extra bonus: you can search for OSM POIs in a given area, export them as GPX and import them into MRA. This way, you can create your own POI libraries in MRA. We have discussed an example ("castles in the UK") here:

                              https://forum.myrouteapp.com/post/58690

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                              • undefined twinfan
                                8 Feb 2025, 18:45

                                Thank you, @Martin-Wilcke . I was contemplating learning more about OSM editing but it is very complex and I wouldn't want to make things worse.

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                                Martin Wilcke
                                wrote on 9 Feb 2025, 19:56 last edited by Martin Wilcke 2 Sept 2025, 19:59
                                #15

                                @twinfan

                                According to Google Street View, there is a railway crossing with two half barrier arms but no extra lift gate (this is the mapping error):

                                OSM-3.jpg

                                So, I recommend making the following changes (for both directions):

                                • Delete the lift gate barrier:

                                OSM-4.jpg

                                Add the "two-half barrier arm" attribute to the railway crossing:

                                OSM-5.jpg

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                                  twinfan
                                  wrote on 10 Feb 2025, 00:27 last edited by
                                  #16

                                  Thank you, @Martin-Wilcke, I will give it a try. I use that intersection regularly, today in fact.

                                  undefined 1 Reply Last reply 10 Feb 2025, 17:16
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                                    twinfan
                                    wrote on 10 Feb 2025, 16:01 last edited by
                                    #17

                                    I made your recommended changes and checked the box asking for a review from an experience mapper, just in case. I also found another intersection about one mile earlier in the route that had a similar condition and revised it. This explains how MRA chose the route it did on my initial try. Thank you again for your guidance. I enjoyed learning about OSM!
                                    Tom

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                                    • undefined twinfan
                                      10 Feb 2025, 00:27

                                      Thank you, @Martin-Wilcke, I will give it a try. I use that intersection regularly, today in fact.

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                                      Martin Wilcke
                                      wrote on 10 Feb 2025, 17:16 last edited by
                                      #18

                                      @twinfan

                                      https://www.openstreetmap.org/note/4613925

                                      Cool! 👍

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                                      8 Feb 2025, 18:45


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