The bike infrastructure seems to only exist south of the river (what some would call "real" Austin). Outside downtown there isn't bike infrastructure, and it is dangerous to bike/walk as most streets are built 6 or more lanes wide, plus a freeway down the middle on some arterials.

Drivers do not expect people to be on foot or on bike, and the arterials are 50 to 60mph in North Austin. Considering that it has become moderately dense with Apartments & Condos in the past decade, its sad that it is dangerous to walk in that area.