Asia Asians chinese commuters commuting locals mass rapid transit movement moving MRT on the move passengers people platform railway seated Singapore standing tourists train transit transport travel travellers waiting abstract angled angles barrier decorative fence fencing nail-holes nailed nails parallel pattern picket-fence pointed points railway-station security separation white white-picket-fence white-pickets wood wooden advice care caution communicating communication danger directing direction directional directive Dirt dirty informing old railway-sign red risks road-sign sign stop traffic traffic-flow warning warning-lights weathered brick bridge cantilever clouds coast cross Edinburgh estuary famous Forth grey iron landmark metal paint painting Queensferry rail river rocks scotland sea shore sky span stone water tower alert appropriate-behavior appropriate-behaviour environment expectorate expectorating health health-risk historic-sign no-spitting not-allowed not-permitted permission-denied pollution prohibited prohibition railway-platform spit spitting unhealthy road suspension