What is rtd bus service? The Regional Transportation District (RTD) is the public transportation service provider for the Denver Metro region, and it includes bus service to/from Longmont. RTD services are funded through a combination of federal transportation dollars, fares and a 0.6 percent sales tax (6 cents for every $10 dollar purchase).How do i get around on rtd? With local, regional, and airport bus routes, you can get where you're going fast and hassle-free on RTD. Learning to ride RTD is easy, even if you've never taken public transportation.What does rtd stand for? The Regional Transportation District (RTD) is the public transportation service provider for the Denver Metro region, and it includes bus service to/from Longmont.Which rtd blue bus routes are being modified? Due to a shortage of transit operators, the North Central Regional Transit District will modify four RTD Blue Bus routes beginning Monday, November 15. The 180 El Rito route and the 400 Los Alamos route will be suspended until further notice.