From MTD marketing director Jan Kijowski:

The Champaign-Urbana Mass Transit District (MTD) is offering a great way to celebrate Earth Day this year! All passengers may ride MTD services for free in celebration of the 40th Anniversary of Earth Day today, April 22. The MTD is proud of the positive environmental impact of using public transportation. MTD services make it possible for community residents and students to take advantage of buses, bicycling, and walking for their travel, all of which have minimal negative effects on the environment. The MTD wishes to encourage everything to do their part to create a healthier community and a healthier planet and ride the MTD free on Earth Day!