Many, many small things can be done to remove unnecessary barriers to traffic flow
Remove/retime traffic lights; remove/re-sign pedestrian crosswalks; create turning lanes; intelligent traffic engineering/education
Traffic lights: remove unecessary lights (e.g., 360 and office park entrance near Greenbelt entrance; 5th and Pressler, on and on); smart lights programmed to change consistent with then-present traffic flow (e.g., not on timers); right and left turn green/blinking yellow turn arrows; use of stanchions on turn lanes to keep flow moving; use of blinking staged lights at stoplights (like in other countries - provides better notice of light changing); stop adding more traffic signals!!(e.g., Bee Cave road; any new development shouldn't be promised a traffic light a the entrance - that should be a risk/livability issue the develop must solve)
Pedestrian crosswalks: the signage and lights used at pedestrian crosswalks are incredibly confusing to drivers - the instructions are confusing - cars stay stopped when nobody in crosswalk; plus, most crosswalks are within 1/4 mile of an intersection with a crosswalk! Change signage and remove redundant crosswalks.
Traffic engineering/education: streets and flow pathways are not optimized (e.g., adding right turn lanes, center turning lanes; bus pull-ins, etc., etc.); drivers are generally poorly educated - They don't use blinkers. They don't pass left/move right. They don't maintain a minimum speed. The city should contribute to driver education with slogans, reminders, etc.
Overall, "innovation" on a big scale isn't going to work as well as many small "innovations" and tweaks to optimize traffic flow and efficiency.