At the height of the cold war in the 60's and 70's, when the M62 from Liverpool to Manchester was built, a long stretch of Motorway through the old USAF Burtonwood airbase was supposedly built straight in case the base needed to be re-activated in a hurry. Probably an urban legend, but who knows ?
There are several examples of military aircraft landing on roads/ motorways. here is a video of a Jaguar landing on the M55 before it opened to the public.