 On the other hand , this mixed technique is already present in the 3rd @-@ century AD aqueduct of Aspendos , and the Romans certainly knew how to build segmented @-@ arched bridges , as attested by surviving examples , three of which are listed by Wurster and Ganzert themselves . An earlier construction date in the 2nd or 3rd centuries AD cannot therefore be excluded . The case for an earlier construction date has been strengthened in recent years with the discovery of further seven Roman segmented arch bridges . The remnants of the nearby Kemer Bridge over the river Xanthos , which dates to the 3rd century and has some architectural similarities with the Limyra bridge , could further reinforce that case . 
