Traffic-light signalling and operation Traffic-light signalling and operation red-and-yellow light Traffic-light signalling and operation Traffic-light signalling and operation Traffic-light signalling and operation view article Traffic-light signalling and operation Traffic-light signalling and operation Traffic-light signalling and operation Traffic-light signalling and operation Yellow light comes on for a few seconds Traffic-light signalling and operation Traffic-light signalling and operation red traffic signals Traffic-light signalling and operation join the flashing yellow club Traffic-light signalling and operation Traffic-light signalling and operation Traffic-light signalling and operation Traffic-light signalling and operation Traffic-light signalling and operation Traffic-light signalling and operation Traffic-light signalling and operation Yellow light comes on for a few seconds Traffic-light signalling and operation Traffic-light signalling and operation