Arrested for Flashing (while fully clothed)

Cops are lying in wait for speeders. You want to warn oncoming motorists, so you flash your headlights on and off.

Does that make you a good samaritan or a low-level criminal?

That question is at the core of a Missouri case that also asks if flashing headlights to communicate is speech protected by the First Amendment. See this Yahoo! News story for details.

Questions...

•Why might the flashing of headlights be considered symbolic speech? What are other examples of symbolic speech?

•How is this case an example of balancing First Amendment rights against other considerations?

•Where would you draw the line between free speech and not jeopardizing police work?