How long is the course of being a traffic officer?

Do you mean "How long does it take to complete the course to become a traffic officer?" If that is your question, then the answer is simple.

It takes as long as it would take to become an official police officer, because it is fully 'badged' police officers who direct, and re-direct traffic when lights go out and so forth.

Police officers in my state usually have a full 4 yr. Bachelors Degree. Once in a great while, someone with two years of Junior college and some years of military service gets accepted in the academy too.

Once in the Police academy, it is 16 weeks of pretty intensive classroom and field training. After that, you would become a rookie cop and probably assigned to traffic issues. In my state, that would involve directing traffic around accidents, making accident reports, and just generally keeping things flowing smoothly. This is often done in the middle of a five-way intersection at 4:00 PM on an August afternoon while it is 114 outside! (And we wonder why cops sometimes have an attitude?)