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Would you consider something like Strava's aggregated GPS traces to complement how confident you are with detected roads?

For example: http://labs.strava.com/routing-errors/#250/17/-46.42546/-21.... gives a fairly strong indication that something is navigable on bicycle or foot; even if OSM hasn't mapped it yet.

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Yeah, I think there is a big future in automated and semi-automated OSM updates, combining trace data and machine learning. That was part of my interest in this.

My company Gaia GPS has millions of GPS traces from hiking and similar outdoorsy activities, so I thought to combine that data (though footways may be more challenging than roads to classify). OSM trace uploads and Strava both seem like good data sources to do this work too.

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