A 500-mile bus rapid transit network operating in HOT Lanes from Frederick, Md. to Prince William County, Va. could be reality within 30 years, according to a study by the Metropolitan Washington Council of Governments.

The proposed bus system would operate primarily in express toll lanes on the region’s interstates, explained Transportation Planning Director Ron Kirby. The buses, which are “somewhere between a regular bus and rail,” would run every 10 minutes during peak hours and every 20 minutes during offpeak hours.