 [ The road had ] " no less than 48 timber bridges of such width that two carts can drive over them side by side " . It had been built by Chang Jung [ Zhang <unk> ] and the other engineers of the <unk> some years before . The wooden <unk> of Chinese bridges from the − 3rd century [ BC ] onwards were no doubt similar to those supposed to have been employed in Julius Caesar 's bridge of − 55 [ BC ] across the Rhine , or drawn by Leonardo , or found in use in Africa . But where in + 13th century [ AD ] Europe could a two @-@ lane highway like Chang Jung 's have been found ? 
