DRIVERS have been warned to expect major delays this weekend as the Dartford Crossing is set to close for seven hours. The QEII Bridge over the Thames is set to close from 10pm to 5am tonight and Sunday night. The Dartford Crossing is expected to be closed for at least seven hours this weekend The bridge is used by around 180,000 cars every day and the closures are expected to lead to delays in the area. Drivers planning on using the bridge a…