I don't know about you, but when I come along side a big transport flatbed truck on the highway I just love seeing that sexy convex curve that's engineered into the bed of the trailer. I keep wanting to shape 53 feet of voussoirs and then fit them over that arched shape and dry lay tons of stones over that. Then I'd shove huge abutment stones up against the sides of both ends and carefully remove the trailer bed. Voila, instant, very flat segmented arch bridge !
