Several weeks ago, I asked why the turn signal law is not enforced. The answer that I got was definitely a non-answer.
If it's a matter of "habit," then start enforcing the law so that it becomes a habit. The seat belt law is being enforced and, to me, it is of much less importance than turn signals.
How many times have you been in traffic and had the car in front of you make an unexpected turn, unexpected because he did not indicate that he planned to turn?