People love to rag on Software Engineers for not being "real" engineers, whatever that means, but American "Traffic Engineers" are by far the bigger joke of a profession. No interest in defense in depth, safety, or tradeoffs. Only "maximize vehicular traffic flow speed."

In this case, being a "traffic engineer" with the ability to sign engineering plans means graduating from an ABET-accredited engineering program, passing both the Fundamentals of Engineering exam and the Principles & Practice of Engineering exam, being licensed as a professional engineer, and passing the Professional Traffic Operations Engineer exam. I think they do a little more than "maximize vehicular traffic flow."