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As a cyclist, I often need to measure the distance between two locations to have a rough idea.

The OSM website contains no ruler, and I was wondering if there were a way to add one, or if a similar site exists that does have one.

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It is easy enough to create a new web map application that does what you need. I would start with the OpenLayer's Measure Example and change the base map and extent to be the area of interest.

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You can use the very fast Open Source Routing Machine for general routing with OSM data. Explicitly for bicyclists I'd recommend OpenRouteService.

However, as far as I know ORS does not support worldwide coverage yet. Check the OSM wiki for more information ( respectively

For more routing engines/websites based on OpenStreetMap data check this wiki post.

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"Sammys Fullscreen Map" does have a measure function on the left side:

more leaflet measure controls include (link to their demo pages at github)

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You can also try BRouter web service which is specialized on bike routing.

Click on the map to define starting point and end/intermediate points, and you will get distances on real ways instantly.

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