Porter v. Martinez

Issue: (1) Whether the government may categorically ban expressive conduct, such as expressive honking of car horns, in the name of traffic safety without presenting any evidence that its ban furthers that interest; and (2) whether the government may categorically ban expressive conduct, such as expressive honking of car horns, where the government had not tried " or at least seriously considered " using less restrictive measures to address its traffic safety concerns.