Billboard proponents emphasize the informational value of a time-honored mode of communication. They point out that billboards convey useful information to the public about legal products. Billboard opponents claim that the large fixtures cause visual blight and negatively impact traffic safety. They argue that without regulation, billboards would overrun highways. Proponents counter that there is no evidence to suggest that billboards cause harm to traffic safety. They argue any regulation of billboards should be reasonable and that, at the very least, the signs should be allowed in commercial and industrial zones.