It is on South Lamar going south, after the bike lane ends near Manchaca. I ride sidewalk until Panther Trail and cut over to Pack Saddle Pass.

I know I can use the whole lane on Lamar, it just seems rude to cars and gives bike commuters a bad name. One of the reasons to commute (at least for me) is to reduce my fuel usage and be a responsible citizen, it seems like causing a mini traffic jam and having people rapidly accelerate around a bike is counter to that purpose.