Leonardo Sketches the Design for a Double-Decker Bridge

Leonardo’s idea for a double-deck bridge is surprisingly modern. It recalls the function of bridges in some modern metropolis where the two-way flow of traffic is arranged on different levels.

Leonardo doesn’t mention what this project was actually for, but it is clear that it is a way of organising the two-way circulation system in such a way that doesn’t create traffic jams or obstructions.

http://www.universalleonardo.org/work.php?id=520