Tunnel Vision?

Lady A snapped this beauty whilst we travelled along the very scenic A505 earlier. I'd never driven along it from Royston to the A1 at Stevenage but it was very pleasant through the Herfordshire countryside and this tunnel, which came out of nowhere, blended in well with the landscape. I did slow done quite considerably for the snap though it didn't help the Blip with me jigging around to Cliff Richard next to her. 'We're all going on a tunnel holiday'.