What a great idea to have an open street map!
Took the first tracks near my home in Bristol the day before yesterday and they look good. I am using a slighltly modified Clarion MAP670 PND to log the tracks as this allows to export tracks in .gpx format.
This morning on my way to work I took some tracks of the Leigh Delamere Services eastbound on the M4 and West Swindon.