Trace a large block around sidewalks and crossings only #251
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A simple next step towards #248 --when tracing a block, if we only consider crossings and sidewalks AND the road has sidewalks on both sides, then we wind up with a nice grouping for the "entire" junction or "entire" road including side-paths.
Here are some junctions of varying complexity:
![image](https://private-user-images.githubusercontent.com/1664407/318045917-6166c8ff-33cc-475e-99ce-9d5a8e1170a1.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3MjEzMDI5OTIsIm5iZiI6MTcyMTMwMjY5MiwicGF0aCI6Ii8xNjY0NDA3LzMxODA0NTkxNy02MTY2YzhmZi0zM2NjLTQ3NWUtOTljZS05ZDVhOGUxMTcwYTEucG5nP1gtQW16LUFsZ29yaXRobT1BV1M0LUhNQUMtU0hBMjU2JlgtQW16LUNyZWRlbnRpYWw9QUtJQVZDT0RZTFNBNTNQUUs0WkElMkYyMDI0MDcxOCUyRnVzLWVhc3QtMSUyRnMzJTJGYXdzNF9yZXF1ZXN0JlgtQW16LURhdGU9MjAyNDA3MThUMTEzODEyWiZYLUFtei1FeHBpcmVzPTMwMCZYLUFtei1TaWduYXR1cmU9NDdiMDM1NTJiYWFlYjFmMGJiODkxYzk4OTJlODEwYTRhZTFjZmE1NmQ2ZDY0NWVhMDg5NWQ1Y2M1M2MwOTEyYSZYLUFtei1TaWduZWRIZWFkZXJzPWhvc3QmYWN0b3JfaWQ9MCZrZXlfaWQ9MCZyZXBvX2lkPTAifQ.KxIO7cUWx4shgP5isA2fpbqVxecpsqlk_4NowQaniz0)
![image](https://private-user-images.githubusercontent.com/1664407/318045978-e2f9a233-aba9-46ba-94ac-88f7a2dc4969.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.ZvbgHUsmbYTa4eXg-OsifKW5552LojMrjDt9-CV5ZWk)
![image](https://private-user-images.githubusercontent.com/1664407/318046083-99694c51-df78-435e-9925-004aa887f7fa.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.BIHDJsd9F3v8G8GGiwEk9beg1ZNY1Abc86Jap0VTwKw)
And some roads:
![image](https://private-user-images.githubusercontent.com/1664407/318046168-62ae0df6-f966-403b-bf14-962c41b5b0a6.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3MjEzMDI5OTIsIm5iZiI6MTcyMTMwMjY5MiwicGF0aCI6Ii8xNjY0NDA3LzMxODA0NjE2OC02MmFlMGRmNi1mOTY2LTQwM2ItYmYxNC05NjJjNDFiNWIwYTYucG5nP1gtQW16LUFsZ29yaXRobT1BV1M0LUhNQUMtU0hBMjU2JlgtQW16LUNyZWRlbnRpYWw9QUtJQVZDT0RZTFNBNTNQUUs0WkElMkYyMDI0MDcxOCUyRnVzLWVhc3QtMSUyRnMzJTJGYXdzNF9yZXF1ZXN0JlgtQW16LURhdGU9MjAyNDA3MThUMTEzODEyWiZYLUFtei1FeHBpcmVzPTMwMCZYLUFtei1TaWduYXR1cmU9YzZhMjlhYjI0YzUyODg4MTc3NmE1ZDc3YWY1OGRmNjBkN2I0M2ExOGEyYmU5YmM4OWM4OTQ4NDIzODBkMjA4YSZYLUFtei1TaWduZWRIZWFkZXJzPWhvc3QmYWN0b3JfaWQ9MCZrZXlfaWQ9MCZyZXBvX2lkPTAifQ.NHdIaIhMhzjHW21pMx2jIghm7PjX5fCXetGQV-vwOnQ)
![image](https://private-user-images.githubusercontent.com/1664407/318046334-613cf4d6-2869-44b5-b9d0-8efc071b10bd.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.Q70AAAHcKgHLCqs4_d32-XoiEQa0KdLdDQb1ixDAYzk)
I think this approach of grouping entire "bundles" of roads or junctions could be used for various purposes:
I'll merge this so people can play with it at https://osm2streets.org. Click a sidewalk, then "Trace sidewalks on left/right" (the direction is... not always consistent, but one should work). Please do comment with any interesting test cases you find, either working or not!