 In contrast to these , most Roman stone bridges were faced with ashlar and rested on <unk> arches , a method which is dominant in other vaulted structures in Lycia too . Compared to the massive and tall semicircular @-@ arched bridges that are typical of Roman architecture , the Limyra bridge , with its flat segmented arches , offers a markedly lower and more elongated appearance , so that Wurster and Ganzert offer a " provisional " late dating , approximately during the reign of emperor Justinian I in the 6th century , during which the use of mixed brick and stone is attested in other structures of the region . 
