I briefly mentioned the Android/iPhone App that Charlottesville's-Albemarle MPO used to collect data. 

http://www.tjpdc.org/cvillebikemapp/

They are now following up with a survey.

In their progress report they mention that participants may be eligible for prizes if they record 10 trips.  I wonder if that skewed results?
It’s been a little over two weeks since we launched  Cville Bike mApp and a lot has  happened. We have collected data, lots of it. As of May 2 and , we have collected 56,576  data points, for 853 trips from 113 users, and those numbers are continuing to climb.   We are hoping to have 1,500 total trips recorded by the end of the recording period.
Anyways, It may be fruitful to find out how successful their data collection initiative has been up to this point.

-Jonathan