[3] Sun Metro began operating its express bus service, named Brio, on October 27, 2014,[4] serving the Mesa Street corridor (part of State Highway 20) between Downtown El Paso and the Westside Transfer Center in Northwest El Paso.

The line uses 22 purpose-built curbside stations with shelters, ticket vending machines for pre-boarding payment, and real-time arrival information.

The Brio fleet consists of 60-foot-long (18 m) branded New Flyer Xcelsior articulated buses powered by compressed natural gas, able to carry 72 total passengers and feature on-board WiFi, interior bike racks, and passenger information monitors.

[5] The project cost $27.1 million to implement, using local funds and a Federal Transit Administration grant.

[6][7] Sun Metro opened its second Brio route, extending the system to Mission Valley via Alameda Avenue at a cost of $35.5 million.