(AREA) — Motorists should be on the lookout as thousands of Adopt-A-Highway volunteers head back to state roadways to pick up litter. Participants in the Michigan Department of Transportation program are cleaning highway roadsides now through Sunday, July 24 during the second of three scheduled pickups this year. Every year, dedicated Adopt-A-Highway volunteers collect about 70,000 bags of trash, generating about a $5 million value annually for state taxpayers. The popular program began in 1990 and has grown to involve nearly 3,000 groups cleaning 6,400 miles of highway. Sections of highway are still available for adoption. Interested groups can get more information at www.michigan.gov/adoptahighway The year’s final Adopt-A-Highway pickup is scheduled in the fall, from Sept. 24 to Oct. 2.