§ Mrs. Chalker
The proposed southern bypass of Okehampton does not traverse the national park; it runs along the northern edge mostly within about 50 yards of that boundary. A cut and cover tunnel would not be a practicable proposition as it would demand unacceptably deep cuttings into the escarpment and the road's proximity to the railway line at Fatherford would make a cut and cover tunnel impossible there without moving the line of the road.
A driven tunnel could be engineered, but either would be extremely expensive. On a conservative estimate a tunnel would cost about £80 million a mile or around £380 million for the 4¾-mile length along the national park. This compares with £22 million for the entire 5¼-mile bypass now planned which, of course, will be almost as well hidden from view as any tunnel.