Police said two men from Silver Spring were the highway workers killed by a driver who fell asleep at the wheel in Charles County.

Marlon E. C. Lorenzo, 28, and Erick T. M. Alvarado, 24, died Thursday afternoon when a Hyattsville man driving westbound on state Route 228 near Waldorf veered off the roadway and into the median. He struck a highway sign and the two State Highway Administration contract workers, Maryland State Police said.