Comfort the bridge channel

  Dream up a situation that there is an over bridge channel in your city. Normally the bridge will be closed to provide road transport and if any large ships need to cross the bridge, then it needs to be opened for ship transport by alerting the road signal, so that the road transport could be stopped. Unexpectedly, one day the hydraulic wires and the signal alert got repair. Assume that you are the overall in-charge for the ship crossing the bridge channel. Now it is your vital responsibility to provide ship transport by opening the bridge after alerting the road signal. It is sure that you will succeed in this by using your experience and brilliance. For this,you need to find the clues and figure out the puzzles needed to find the necessary objects.