Hi,
TurtleBot3 - DuckieTown is like-a concept car. Now we are supporting who want to dig into the driving autonomy with TurtleBot3 by TurtleBot3_AutoRace package, which will become ROS kinetic package soon.
You can also download Track file and ROS-referee system for AutoRace
Those sources are based on the AutoRace challenge which was held end of last year.
We will officially announce those contents on everywhere including ROS Discourse sooner.