Traffic Watchers

When the city engineers need to find out details about how traffic intersections are working - or not - they will send out cadres of folks with diabolical appearing gadgets to monitor traffic patterns.
At the push of a button, these Jamar Technologies devices can collect information such as turning movement data while classifying up to 14 groups of vehicles. Measure delay and queues at stop sign controlled intersections and do speed studies to find running speeds on signalized intersections.

Apparently very exciting information for city engineers to ponder while considering changes in intersection design.