Me I would be most grateful for including material on the medieval superbridge at Trezzo sull Adda Why Because this bridge must have been amazing as it doubled the longest span of stone bridges then from 37 to 72 Still the briidge is almost unknown as nobody covers the subject There is also a claim that the Etruscans build very early on stone arch bridges earlier than both Greeks and Romans Two of them are included in Structurae but I am not sure whether these are still the original structures Including the Etruscans in a comprehensive history of stone arch bridges would definitely be an almost revolutionary thing For the timeline see also Trajan s Bridge longest span for a 1000 years Ponte Santa Trinit first elliptical arch bridge Steinerne Br cke in Regensburg Germany model for many medieval bridges to come Pont Saint B nezet IMHO this bridge could be the first segmental arch bridge in Europe What we need is the span rise ratio Regards