It's a well-known fact that civil engineers are the guys who can't cut it in the other types of engineering. Combine that with engineers being the guys who can't cut it in physics or math and you've got some pretty bonked out traffic lights.
To illustrate...a mathematician, a physicist and an engineer were posed with the following problem: prove that all odd numbers greater than one are prime.
Mathematician: 3 is prime, 5 is prime, 7 is prime, 9 ... is not prime, therefore the assertion is false.
Physicist: 3 is prime, 5 is prime, 7 is prime, 9 ... experimental error, 11 is prime, 13 is prime, 15 ... experimental error, ...
Engineer: 3 is prime, 5 is prime, 7 is prime, 9 ... is prime, 11 is prime, 13 is prime, 15 ... is prime, ...