steel bridge girder span, blue grey metal pillar guardrails, modern industrial flyover overpass railings perspective

abstract architecture background beam beneath blank blue bridge closeup construction contemporary copy crossbeam design detailed durable empty engineering flyover footbridge frame geometry girder grey guardrails handrails highway industrial iron isolated large metal modern outdoors outside overpass pass passage pattern perspective pillar railing railings rails rivets road space span steel strength strong structure support techonolgy transportation urban vertical view walkway white