More than 5,100 Allegheny Power customers in Hagerstown and Washington County lost service Tuesday evening after thunderstorms passed through the area, a company spokesman said.
The Washington County Sheriff's Department received numerous reports of downed trees and traffic lights without power, Lt. Travers Ruppert said.
At Fountainhead Road and Pennsylvania Avenue, a traffic light fell on a car, Ruppert said.
The sheriff's department had officers controlling traffic at "key intersections," he said.
Boonsboro and Clear Spring also were affected, but Allegheny Power spokesman Allen Staggers said "a lot of Hagerstown addresses" lost power.
Along the Dual Highway, about 1,000 customers were without power Tuesday night, he said. At the intersection of Eastern Boulevard and Dual Highway, police used flares to direct traffic.