Very interesting, but unfortunately the one example they pulled was incorrect. If you look at the street sign is says "Exit | 45 mph", which means this is the speed limit when taking the exit. The captured example looses this information.
This is really promising, especially:<p>> Finally: we do not have any plans to automatically add any of this detected information to OSM. Any improvements will always be made manually by mappers through the existing JOSM plugin, iD integration (coming) and MapRoulette.<p>This points the way forward for OSM. OSM is a human map made from user contributions - the collected set of users' enthusiasms. That's what differentiates it from other maps. But that shouldn't mean that mapping should be a laborious process. The more innovations like this that remove the gruntwork from mapping, the better. (Same applies to recognising geometries from imagery and sensor data, etc.)