A bridge used by thousands of people each day is to shut for parts of the summer in a move expected to bring travel chaos. Kingsferry Bridge is used by motorists, pedestrians and rail passengers to travel to and from the Isle of Sheppey to mainland Kent via the A249. Built in its current form by British Rail in 1960, the vertical-lift bridge is the only route trains can use to get across The Swale. However, it is to close for 20 days throughout June and July. Network Rail says emergency repairs need to be carried out to 40 steel ropes, which support the bridge when it lifts for maritime traffi…