Alerting drivers to road hazards. Maintenance workers may be called on to set up flares or traffic cones to warn drivers about accidents or other road hazards.nInstalling and maintaining road signs. There are more than 1.3 million state-owned signs in Pennsylvania.nBridge maintenance. PennDOT inspects bridges at least once every two years. The average age of a bridge in Pennsylvania is 50 years.nLine painting. Yellow and white traffic lines must be repainted in the summer when the weather is warm and dry.nPipe maintenance. Controlling water flow around roadways is essential to maintaining pavement. Pipe maintenance is a year-round activity.