Ever thought the car horn was simply not expressive enough? On Wednesday, New Jersey-based Roadmaster USA announced something I've been wanting since my teenage years: scrolling message systems.
 
These let drivers display messages like "Slow down," "Help me," or "Your lights aren't working." Or, more probably in my case, "Get out of my way."

The messages (or in some cases, ads) scroll on cars' license plate holders or in their back windows and can be adjusted using a wireless remote. But the company warns that scrolling LED messages on moving cars may be restricted in some areas.

Still, at $69 each, these systems will surely bring new levels of rudeness--and of flirtation--to the driving experience. Watch out for drivers paying more attention to their messages than to the roads.