Volunteers who want to participate in the annual Great Pennsylvania Cleanup can do so on April 23.

Volunteers who want to pick up litter along state roads, in parks and other areas should call 724-284-8800, state Department of Transportation spokesman Jim Struzzi said.

"This is the time of year when we need the most help since a winter's worth of litter and debris have accumulated along our roadsides," said Richard Hogg, PennDOT district executive.

PennDOT will provide trash bags and safety vests for the volunteers, and collect the trash, a press release said.

On April 22, office employees of PennDOT District 10, which includes Butler County, will pick up litter for part of the day, the release said. On April 25, the district's maintenance workers will lend a hand.

April 23 has been designated as the day for volunteers to help.

Also individuals, civic groups, businesses, schools and universities can join the Adopt-A-Highway program. They are given a two-mile section of a state road to clean-up four times a year, and a sign along the road to give them recognition for their efforts.

To join that program, Butler County residents should call the number listed above.

Volunteers in Armstrong County should call 724-543-1811; Clarion, 814-226-8200; Indiana, 724-357-2862; and Jefferson, 814-938-6300.

People seen littering can be reported to PennDOT's hotline at 1-888-LITTERBUG.

If possible, anyone reporting a scofflaw should note a license plate number, type of vehicle, its color, the time, location, and what kind of litter, PennDOT said.

If identified, the offender will be sent a letter asking him to stop, and a litterbag as a reminder, PennDOT said.