Flag motorists to warn them of obstacles or repair work ahead. Set out signs and cones around work areas to divert traffic. Perform preventative maintenance on vehicles and heavy equipment. Drive heavy equipment and vehicles with adjustable attachments to sweep debris from paved surfaces, mow grass and weeds, remove snow and ice, and spread salt and sand. Drive trucks to transport crews and equipment to work sites. Haul and spread sand, gravel, and clay to fill washouts and repair road shoulders. Dump, spread, and tamp asphalt, using pneumatic tampers, to repair joints and patch broken pavement. Clean and clear debris from culverts, catch basins, drop inlets, ditches, and other drain structures. Remove litter and debris from roadways, including debris from rock and mud slides. Erect, install, or repair guardrails, road shoulders, berms, highway markers, warning signals, and highway lighting, using hand tools and power tools. Inspect, clean, and repair drainage systems, bridges, tunnels, and other structures. Perform roadside landscaping work, such as clearing weeds and brush, and planting and trimming trees.