Question: how long are the tyne tunnels?
Answer: The vehicle tunnel is 1 mile or 5,500 feet (1,700 m) long and has a diameter of 31 ft 3 in (9.5 m) with a roadbed 24 ft (7.3 m). It was built by Edmund Nuttall Limited and was opened by Queen Elizabeth II on 19 October 1967, but commenced operational use only in 1968, on completion of the northern link roads.