▁two ▁( Tra jan ' s ▁Bridge , ▁Const antine ' s ▁Bridge ) ▁and ▁the ▁middle ▁and ▁lower ▁Rh ine ▁by ▁four ▁different ▁brid ges ▁( R oman ▁Bridge ▁at ▁Main z , ▁Ca esar ' s ▁Rh ine ▁brid ges , ▁Roman ▁Bridge ▁at ▁Kob len z , ▁Roman ▁Bridge ▁at ▁C ologne ). ▁For ▁rivers ▁with ▁strong ▁curr ents ▁and ▁to ▁allow ▁swift ▁army ▁movements , ▁p onto on ▁brid ges ▁were ▁also ▁rout in ely ▁employed . ▁Go ing ▁from ▁the ▁distinct ▁lack ▁of ▁records ▁of ▁pre - mod ern ▁solid ▁brid ges ▁sp anning ▁larger ▁rivers , ▁the ▁Roman ▁fe at ▁appears ▁to ▁be ▁un sur pass ed ▁anywhere ▁in ▁the ▁world ▁until ▁into ▁the ▁ 1 9 th ▁century . ▁ ▁Gallery ▁ ▁See ▁also ▁ ▁List ▁of ▁Roman ▁brid ges ▁Br id ges ▁in ▁Rome ▁Record - hold ing ▁brid ges ▁in ▁anti qu ity ▁Roman ▁architecture ▁Roman ▁architect ural ▁revolution ▁ ▁Foot notes ▁ ▁References ▁ ▁Fu entes , ▁Manuel ▁Dur án : ▁La ▁constru cción ▁de ▁pu entes ▁roman os ▁en ▁His p ania , ▁X unta ▁de ▁Gal icia , ▁Santiago ▁de ▁Com post ela ▁ 2 0 0 4 , ▁ ▁External ▁links ▁▁ ▁Tra ian us ▁- ▁Techn ical ▁investigation ▁of ▁Roman ▁public ▁works ▁The ▁W aters ▁of ▁Rome : ▁T iber ▁River ▁Br id ges ▁and ▁the ▁Development ▁of ▁the ▁An cient ▁City ▁of ▁Rome ▁Liv ius . org : ▁Pont es ▁long i ▁– ▁Roman ▁bog ▁brid ges ▁