Turn lane information is crucial for providing great turn-by-turn guidance in navigation applications. When approaching an intersection for a turn, your navigation system should tell you which lane to be in.

Over the last two months, we’ve collaborated with the OpenStreetMap community to expand turn lane coverage in OpenStreetMap for select cities. In total, we added 40,593 turn lanes to San Francisco, Washington DC and Los Angeles.

Map showing the coverage of turn lanes in Los Angeles on OpenStreetMap (overpass turbo query).

Join the mapping!

We’re just getting started! If you are interested in mapping turn lanes in your city, read our guides on turn lanes and JOSM to get warmed up, then jump into our turn lane mapping project.

If you have questions or more ideas for mapping turn lanes, find me on OpenStreetMap or on Twitter.