subway tunnel walkway with no people. public transportation, construction industry, civil engineering, city life, or futuristic in

airport architecture asia attraction background bangkok building business city civil communication commute construction corridor design development district downtown economic economy engineering entrance exit finance financial floor futuristic hall indoor industry infrastructure interchange interior intersection landmark light loop metro mitrtown modern move mrt office path pedestrian public road samyan station structure subway technology thailand tourism tourist traffic train transit transport transportation travel tube tunnel underground urban walk walkway way work