Flatiron Flyer is an 18-mile (29 km) express bus system between Denver, Aurora, and Boulder, Colorado, traveling along U.S. Route 36. Different levels of service are available, including a non-stop from Boulder to Union Station in high-occupancy toll lanes (HOT lanes), and all-stop, which serves six park-and-rides along U.S. Route 36 in normal highway lanes. The line branches out to different destinations in Denver, Aurora and Boulder. The Regional Transportation District operates the line, opened on January 3, 2016. The ITDP classified the system as "not bus rapid transit", due to the use of lanes shared with private cars along US 36, lack of street level boarding/alighting and the lack of an off-board fare system. The system has been criticized of bus rapid transit creep. From Wikipedia
