am ag ara ▁Bridge ▁in ▁C app ad ocia ▁may ▁represent ▁the ▁earliest ▁surv iving ▁bridge ▁featuring ▁a ▁pointed ▁arch . ▁ ▁Arch ▁shapes ▁▁ ▁Early ▁Roman ▁arch ▁brid ges , ▁influenced ▁by ▁the ▁ancient ▁notion ▁of ▁the ▁ideal ▁form ▁of ▁the ▁circle , ▁often ▁describe ▁a ▁full ▁circle , ▁with ▁the ▁stone ▁arch ▁continu ing ▁under ground . ▁A ▁typical ▁example ▁is ▁the ▁P ons ▁Fab r ici us ▁in ▁Rome . ▁Later , ▁Roman ▁m ason ry ▁brid ges ▁rest ed ▁mostly ▁on ▁semi - circ ular ▁arch es , ▁or , ▁to ▁a ▁less er ▁extent , ▁on ▁segment al ▁arch es . ▁For ▁the ▁later ▁design , ▁which ▁shows ▁an ▁early , ▁local ▁concentration ▁in ▁north - e astern ▁Italy , ▁but ▁can ▁be ▁found ▁scattered ▁throughout ▁the ▁whole ▁emp ire , ▁the ▁Lim y ra ▁Bridge , ▁the ▁Al con ét ar ▁Bridge ▁and ▁the ▁P onte ▁San ▁Lorenzo ▁are ▁prime ▁examples . ▁In ▁addition , ▁a ▁number ▁of ▁other ▁arch ▁forms ▁make ▁rare ▁appearances , ▁in ▁some ▁cases ▁of ▁which ▁later ▁de form ations ▁cannot ▁be ▁ruled ▁out . ▁The ▁late ▁ant ique ▁Kar am ag ara ▁Bridge ▁represents ▁an ▁early ▁example ▁for ▁the ▁use ▁of ▁pointed ▁arch es ▁ ▁Typ ical ▁characteristics ▁▁▁ ▁Many ▁are ▁more ▁than ▁ 5 ▁metres ▁wide ▁ ▁Most ▁of ▁them ▁slope ▁slightly ▁ ▁Many ▁have ▁rust ic ▁work ▁ ▁The ▁stone work ▁has ▁altern ating ▁st ret cher ▁and ▁header ▁courses ▁; ▁i . e . ▁one ▁layer ▁of ▁rect angular