The extension, which is part of RTD’s Fastracks transit expansion programme, serves new stations at Sky Ridge, Lone Tree City Center and RidgeGate Parkway, with parking spaces for 1300 cars.

The $US 233.1m project was funded with the aid of a $US 92m grant from the Federal Transit Administration Small Starts programme, $US 9.4m in Congestion Mitigation and Air Quality grant funding, and $US 25m from the City of Lone tree and local stakeholders.

The extension was designed and built by Balfour Beatty Infrastructure under a contract awarded by RTD in 2015. Construction began in May 2016.

Services will operate at five-minute intervals during peak periods and every six minutes at other times.