<div dir="ltr"><div><div><div><div><div><div>I saw <a href="http://www.openstreetmap.org/user/daniel-j-h">Daniel</a>'s <span id="gmail-goog_1873302065"></span><a href="/">diary entry<span id="gmail-goog_1873302066"></span></a> several weeks ago when it was included in the weekly OSM email and was very intrigued with the project. The ideas behind his work seemed solid and a real problem was pointed out that could be fixed to improve things.<br><br></div>However, I'm a little bit confused on what the recommended solution is to these "sharp turns". The diary entry didn't call them out explicitly, and the Goff Mountain example in the diary remains unchanged as of yet. For Goff Mountain, are you supposed to click on the node intersection at the "second ramp" and change the green arrow allowing a near-u-turn to red so that routing software won't try to send the user into a potentially illegal or dangerous maneuver?<br><br></div>That was my assumption on the proper fix, so I went ahead and made a couple of hundred changes in my state. After I was complete with my state, I noticed that many of my changes were being reverted or overwritten and the turn restrictions removed. I asked the user why they were undoing my changes and they rightly pointed out <a href="http://wiki.openstreetmap.org/wiki/Relation:restriction">Relation:restriction</a> wiki page which states "<b>Don't map </b> turn restrictions that are <b>the default</b> for a given jurisdiction <b>and</b> are <b>not signed</b>.
It is much better to ensure that routing engines embody the regional
rule rather than mapping every occurrence as a turn restriction.<span class="">" They suggested instead to use some turn lane plugins for JOSM, but after reading up on those, they seemed incredibly complex and require a lot more work than simply saying "you can't turn right on that ramp" with a couple of clicks in iD. It is also very difficult to tell from satellite images just how many lanes exist for some of these places, so it makes mapping properly with lane designations impossible to do remotely and would require field work and will likely mean the end of this clean-up.<br><br></span></div><span class="">So I turn to this list to find out what the right approach is. Is the recommendation to not add turn restrictions to an intersection as the wiki states since they are not signed? Is it to work with the JOSM plug-ins to do the more labor intensive mapping and splitting and counting of lanes and their individual restrictions?<br><br></span></div><span class="">At this point I'm stuck on what is right. Please help.<br><br></span></div><span class="">Thanks,<br></span></div><span class="">b-jazz<br><br></span></div>