Traffic count
This was taken at an overhead bridge above the stretch of PIE between Aljunied Road and Paya Lebar Road, mid afternoon.
Looks like they were doing traffic count - counting the vehicles using the the PIE.
That reminds me of my first temporary job - as a traffic enumerator for the PWD. (I'm not sure if enumerator is the correct word or not. In case you don't know, PWD stands for Public Works Department.) A group of us just stood at some road junctions for a few hours counting traffic using the roads with hand-held counters. I think it lasted about two or three weeks. We were paid by the hours.
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