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SYSTEMS PREPARATION QUESTIONS 2007 - 9 |
V. Ryan © 2007 - 2017 |
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The traffic control system shown below has INPUTS and OUTPUTS. Each input and output has a number - these are listed on the diagram below. |
Write the control sequence for the following sequence of events: Please note, when the barrier is raised/open it is ‘ON’. When the barrier is lowered/closed it is ‘OFF’. The first five stages have already been completed. |
ANSWER |
Suggest two improvements to the traffic control system shown in the diagram above. |
IMPROVEMENT 1: |
IMPROVEMENT 2: |
ANSWER |
IMPROVEMENT 1: The system should have an audible (sound) warning as well. This would allow the drivers to hear as well as see warnings that the barrier is about to be closed.
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