used on the FreeRide, a
battery electric bus The 16th Street FreeRide is a free shuttle bus service operated by the RTD along the length of the 16th Street Mall, with buses stopping at every intersection. The service began in 1982 as the 16th Street MallRide, originally running between Market Street Station and Civic Center Station (16th & Broadway), two major RTD bus hubs at either end of downtown. In 1994, light rail transit service was added at 16th & California and 16th & Stout stations, creating a third transit hub along the mall. In 2011, the route was extended north of the mall on 16th Street to
Denver Union Station. In 2014, Market Street Station was closed and replaced by the Union Station Transit Center. In 2025, coinciding with the dropping of "Mall" from the 16th Street Mall name, the service was renamed 16th Street FreeRide. As of 2024, the route provides connections between the
A Line,
B Line,
E Line,
G Line,
N Line, and
W Line and the bus hub at Denver Union Station; the
D Line,
H Line, and
L Line at 16th & California and 16th & Stout stations; and the bus hub at Civic Center Station. In 2018, the route saw an average weekday ridership of 43,971, Buses operate from 5:30 a.m. to midnight on weekdays, with slightly shorter service hours on weekends and holidays. During peak periods, shuttles can run as frequently as every 90 seconds, with service reduced to every 10 minutes in the early morning and late evening. Since the service's inception, RTD has used custom-designed
right-hand drive buses. This configuration gives operators improved visibility of passengers boarding and alighting from the curb side, as well as pedestrians who often move close to the buses, which travel at speeds up to in the open mall setting. The buses also feature a low-floor design with an open interior with minimal seating (currently 18 seats, out of a capacity of 106), and three doors, enabling near-level boarding and accommodating fast passenger flow both inside the bus and during boarding and alighting. The first-generation buses, used from 1982 to 1999, were diesel-powered and front-wheel drive. The second-generation "EcoMark" buses, used from 1999 to 2016, were
series hybrids with
wheel hub motors powered by batteries charged from a , 1.6-liter
compressed natural gas engine supplied by
Ford. The third-generation
BYD K10MR buses, introduced in 2016, are fully battery electric. == Impact as an urban space ==