This query was triggered by the following comment in another thread, but I'll start a new thread so as not to distract the original.
" 'Don't split ways if there is no physical separation' is one of the core tenets of highway mapping in OSM." My query is about how to correctly map an intersection in Perth while abiding by the above. I will try to describe the situation as best I can without being able to resort to a sketch: - there is a junction between 2 major highways in Perth (Roe & Tonkin Highways) - there is a slip road off one (Roe heading west) that merges with the 2 lanes of the other (Tonkin heading south) - from the merge point there are 3 lanes (the slip lane + the 2 through lanes) - from the merge point, there is no physical barrier down to the traffic lights at the next intersection (Hale Rd - which is quite close - hundreds of metres) - however there is a solid white line between the slip lane and the 2 continuing lanes - right to the next intersection - this means you cannot legally come off the slip lane and turn right at the next intersection (Hale Rd) because you cannot legally cross the solid white line This has currently been mapped "as normal", ie 1 slip lane joining a 2 lane road, becoming 3 lanes after the merge point. Other than maintaining the slip road as a separate way right to the next intersection (with a no right turn), how else would this be mapped so people coming off the slip road cannot turn right at the next intersection? Ian
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