I went to San Mateo for a free trip to Timberland Heights on the mountains of San Mateo and passed by Commonwealth avenue and batasan (no routing errors here) as timberland is well mapped (except wrong name and road should be private)

only noticed missing u-turn slots on commonwealth between Tandang Sora and Batasan, about 4 or 5 of them while some are misplaced. These can potentially route incorrectly if you're going to some roads between the two points.

how was i able to spot them errors? It's just whenever I see u-turn slots, I glance at my Nuvie to see if it's there, most of the time, they're not there on the stretch I mentioned.

only the slots from UP to circle is correctly mapped (as i also frequent the place en route to/from Katipunan)