The Rhode Island Avenue Limited Line, designated Route G9 was a limited stop peak hour-only MetroExtra bus route operated by the Washington Metropolitan Area Transit Authority between Mount Rainier Terminal and Franklin Square.

This route provided a one seat ride between Mount Rainier and Downtown DC during the weekday peak-hours so passengers wouldn’t have to board the train.

Route G9 provided service between Mount Rainier Terminal and Franklin Square along Rhode Island Avenue during weekday peak hours only.

This route provided a one seat ride between the two points so passengers wouldn't have to transfer to rail or other buses during peak hours.

Both routes operated between Highview Apartment Complex in Hyattsville, Maryland, all the way up to Downtown DC primarily running on Queens Chapel Road.

It would give residents of Ward 5 and Mount Rainier more frequent and more direct service to downtown, and offer them quicker connections with other major bus routes.

[8][9] The route would be funded as a reimbursement project, meaning WMATA is running it and DC is paying the agency for the costs.

It would also operate a limited stop segment between Mount Rainier and Rhode Island Avenue–Brentwood station with routes T14 and T18.

If route G9 remained on Rhode Island Avenue, it would have to travel further out to make a u-turn which can cause delays and scheduling problems unless it was extended beyond Mount Rainier.

The no boardings at Mount Rainier for route G9 could negatively affect ridership, which wouldn't be good for DC residents paying WMATA for costs or businesses that might welcome custom from a neighboring jurisdiction.