Near my home, Google Maps shows some "bike trails" that are really foot trails that are not bike legal, but are commonly poached on MTB's. In fact all footpaths on the north side of the lake are not bike-legal, only the ARBT and fire roads. One of the wrongly marked "bike trails" is too steep for anyone but a committed downhill racer. There are more poached trails than the map shows... for instance, just north of this link there's a footpath to the west of the bike trail in the trees, and there are more trails than shown between the bike path and the lake.