Actually, I believe this will work. In my opinion, one of the reasons that driving in traffic sucks so hard is because of the limited amount of information the pilots of automobiles are able to pass to each other, because they are sealed up in big metal and glass boxes, limiting the information transfer to the use of a single-note horn, turn signals, headlights, and brake lights. If you are able to communicate to fellow drivers things like, "Excuse me, may I get in here?", this is a much more nuanced and information-rich set of information than a simple blinking indicator. Allowing for greater information-rich communication between cars on the road will, in my opinion lead to a more pleasant driving experience, because human interactions are heavily dependent on emotional cues, i.e. politeness.