There should really be a written code of ethics for driving. Laws just don't cut it. Look - when you're switching lanes use your turn signal. It's one of the little appendages that juts out from the steering wheel base. You paid all that money for your car - make use of every penny. Let me just count the times that I've seen a driver switch lanes without indicating, almost causing an accident. And let's not forget our fellow police officers. When was the last time you saw a cop use a signal to switch lanes or even make a turn? Don't get me wrong - I love surprises. But that's one of those, "F@#%in c*nt!" surprises.
And for your convenience I've provided a link to a helpful page that is all about turn signals:
http://auto.howstuffworks.com/turn-signal.htm
Happy driving.
