Traffic signal

The average on the traffic signal problem is 8/15. The most frequent score was actually 15/15; many students crushed this problem, about 1/8th of class.

But many students had absolutely no idea how to attack this most basic problem, which brought the average down significantly. That is inexcusable since the traffic signal problem is a virtual copy of a problem we studied in lecture on Sept. 18, the bird on a wire, and on the midterm exam, the Spider-Man problem.