Traffic backed up for more than an hour on both sides of the Chester River Bridge on Tuesday after State Highway Department technicians could not fully lower the bridge following earlier testing. The Kent County News reports, unable to lower the bridge using regular methods, technicians had to hand crank it down, according to a State Highway worker. The foreman of Covington Machine and Welding, a contractor working with the Maryland State Highway Administration on bridge rehabilitation, said that when it is hot the metal tends to expand and bind up, causing bridge malfunctions.