Can you flip off someone while driving? Cuss them out? See California's rules about road rage
Briefly

In California, while cursing or making obscene gestures while driving is protected by the First Amendment, aggressive behaviors can lead to significant legal consequences.
California is ranked number one in the nation for road rage, highlighting the prevalence of confrontational behavior among drivers in the state. Aggressive actions can include yelling, making rude gestures, or driving aggressively.
California law stipulates that aggressive driving can result in serious penalties under Vehicle Code 23103. This includes fines up to $1,000 or jail time for misdemeanors.
Read at Sacramento Bee
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