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    1. They programming/adjusting the timing of the traffic light and/or install new lights into the system.

    2. Umbrella for weatherprotection while they are working on the traffic lights circuits and/or programming

    3. Could be a traffic count…usually conducted by students to explore possible reconstruction measures…

    4. Seems like a traffic census (_Verkehrszählung_) to me.
      They do get volunteers to do it once a year. Pretty much would look like this

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