Civil Engineering Reference
In-Depth Information
Fig. 15.2
The emergency
buttons
Fig. 15.3
Operating panels
the barrier gates for example, without first switching the traffic light to red -
then the carrying out of this command is not possible and it is drawn to the
operator's attention. Aside from that, when he takes a decision which could
lead to problems in the long run, he is asked for a confirmation.
Only useful information
For the monitoring and operating of the traffic it is not desirable that the
operator's attention in the interim, is drawn to signals which don't concern
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