▁runs ▁along ▁the ▁western ▁side ; ▁between ▁the ▁main ▁road way ▁and ▁the ▁western ▁b icy cle ▁path ▁lies ▁the ▁North ▁Sh ore ▁railway ▁line . ▁ ▁The ▁main ▁road way ▁across ▁the ▁bridge ▁is ▁known ▁as ▁the ▁Brad field ▁Highway ▁and ▁is ▁about ▁ ▁long , ▁making ▁it ▁one ▁of ▁the ▁short est ▁high ways ▁in ▁Australia . ▁ ▁Arch ▁ ▁The ▁arch ▁is ▁composed ▁of ▁two ▁ 2 8 - panel ▁arch ▁tr uss es ; ▁their ▁height s ▁vary ▁from ▁ ▁at ▁the ▁centre ▁of ▁the ▁arch ▁to ▁ ▁at ▁the ▁ends ▁next ▁to ▁the ▁p yl ons . ▁ ▁The ▁arch ▁has ▁a ▁span ▁of ▁ ▁and ▁its ▁sum mit ▁is ▁ ▁above ▁mean ▁sea ▁level ; ▁expansion ▁of ▁the ▁steel ▁structure ▁on ▁hot ▁days ▁can ▁increase ▁the ▁height ▁of ▁the ▁arch ▁by ▁. ▁ ▁The ▁total ▁weight ▁of ▁the ▁steel work ▁of ▁the ▁bridge , ▁including ▁the ▁arch ▁and ▁approach ▁sp ans , ▁is ▁, ▁with ▁the ▁arch ▁itself ▁we igh ing ▁. ▁About ▁ 7 9 % ▁of ▁the ▁steel , ▁specifically ▁those ▁technical ▁sections ▁const itut ing ▁the ▁curve ▁of ▁the ▁arch , ▁ ▁was ▁imported ▁pre - formed ▁from ▁England , ▁with ▁the ▁rest ▁being ▁s our ced ▁from ▁. ▁On ▁site , ▁the ▁contract ors ▁( D orm an ▁Long ▁and ▁Co .) ▁set ▁up ▁two ▁work sh ops ▁at ▁M ils ons ▁Point , ▁at ▁the ▁site ▁of ▁the ▁present ▁day ▁L una ▁Park , ▁and ▁fabric ated ▁the ▁steel ▁into ▁the ▁g