<html><head></head><body><div class="ydp4a32fe81yahoo-style-wrap" style="font-family:times new roman, new york, times, serif;font-size:16px;"><div><div dir="ltr" data-setdir="false"><div><div>I must say that I am very reluctant to spend (waste ?) my time mapping arrows on traffic lanes, when I see so many in my local area that do not reflect the directions that traffic can / should take from that lane.</div><div><br></div><div>When reading what follows, please note that I live in the UK, where we drive on the left. </div><div><br></div><div>I am thinking particularly of several cases where 3 or 4 lanes approach a roundabout, with the right lane(s) showing a single arrow, pointing straight ahead, despite the fact that it is perfectly legal and safe to use the roundabout to turn right. Indeed, once on the roundabout, drivers will often see arrows indicating that they can turn Right.</div><div><br></div><div>The worst example (IMHO) is an approach with 3 lanes, shown in the image (taken from Bing) at:<div class="pasted-link"><a href="https://www.dropbox.com/s/mvhs9l59xig0xke/2022-06-14%20Road%20Arrows.png?dl=0">https://www.dropbox.com/s/mvhs9l59xig0xke/2022-06-14%20Road%20Arrows.png?dl=0</a></div></div><div><br></div><div>The road markings have a few issues:</div><div><br></div><div>1.<span style="white-space: pre-wrap;"> </span> On initial approach (where there are only 2 lanes), the arrow in the Right lane shows “turn Right only”, but a few yards further on, the next arrow in that lane shows “ahead, or turn right”.</div><div>2.<span style="white-space: pre-wrap;"> </span>In the 3-lane section (numbering Left to Right), </div><div> a.<span style="white-space: pre-wrap;"> </span>Lane 1 shows “turn Left only”, which is correct. </div><div> b.<span style="white-space: pre-wrap;"> </span>Lane 2 shows “ahead only”, which could be fine, if it did not also show “M1”. The M1 is the major Motorway, which runs nearby, to reach which you need to turn Right at the roundabout. So the driver is being invited to turn right from this lane. </div><div> c.<span style="white-space: pre-wrap;"> </span>Lane 3 shows “ahead, or turn Right” and “M1”, which could be fine, if Lane 2 were not also being invited to turn right. Any driver going ahead from Lane 3 would collide with (or, if they are lucky, cross with) a driver in Lane 2 turning Right. </div><div><br></div><div>My conclusion is that I do not want to map (and potentially have routers act on) painted arrows that are blatantly incorrect. </div><div><br></div><div>One could argue that mapping these arrows is merely documenting what exists on the ground, but my view is that this is not useful.</div></div></div><div><br></div><div class="ydp4a32fe81signature"><div style="font-family:new times, serif;font-size:16px;"><div>Regards,</div><div dir="ltr">Peter</div><div dir="ltr"><br></div> Peter Neale
<br>t: 01908 309666
<br>m: 07968 341930<br></div></div></div>
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On Tuesday, 14 June 2022, 11:43:19 BST, Minh Nguyen <minh@nguyen.cincinnati.oh.us> wrote:
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<div><div dir="ltr">Vào lúc 05:54 2022-05-30, Tod Fitch đã viết:<br clear="none">> For arm chair mapping using aerial imagery I only add turn lanes, never <br clear="none">> turn restrictions. For turn restrictions I want to see the signage, so <br clear="none">> that is in person or using something like Mapillary.<br clear="none"><br clear="none">That's a good practice in the U.S. In some states like California, <br clear="none">U-turns are frequently but not always allowed, but U-turn arrows are <br clear="none">rarely marked on the pavement. Looking at aerial iamgery, you can be <br clear="none">more confident of a turn restriction if "ONLY" accompanies the arrow <br clear="none">marking, but even then, I've seen abutting driveways that contradict <br clear="none">straight-only markings.<br clear="none"><br clear="none">Street-level imagery can also be helpful for replacing "none" with <br clear="none">explicit "through" or "through;right" indications. For example, Ohio <br clear="none">religiously posts lane use diagram signs along its state routes, even at <br clear="none">every abutting business's driveway. These signs always bear each lane's <br clear="none">indications explicitly, unlike road markings in many cases.<br clear="none"><br clear="none">-- <br clear="none"><a shape="rect" href="mailto:minh@nguyen.cincinnati.oh.us" rel="nofollow" target="_blank">minh@nguyen.cincinnati.oh.us</a><div class="ydp569fc965yqt0994664010" id="ydp569fc965yqtfd97096"><br clear="none"><br clear="none"><br clear="none"><br clear="none"><br clear="none">_______________________________________________<br clear="none">Tagging mailing list<br clear="none"><a shape="rect" href="mailto:Tagging@openstreetmap.org" rel="nofollow" target="_blank">Tagging@openstreetmap.org</a><br clear="none"><a shape="rect" href="https://lists.openstreetmap.org/listinfo/tagging" rel="nofollow" target="_blank" fg_scanned="1">https://lists.openstreetmap.org/listinfo/tagging</a><br clear="none"></div></div></div>
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