California Department of Transportation, California Highway Patrol, City of Fortuna, Caltrans maintenance crews, office staff and Adopt-A-Highway volunteers will host a litter removal and enforcement day from 8 a.m. to 4 p.m. Tuesday. The event will honor long-term Adopt-A-Highway volunteers for their their efforts. Volunteers and crews will also remove trash near Redwood National and State Park and near Elk Valley Rancheria. Humboldt and Del Norte counties are both in Caltrans District 1.