Is it Illegal to Flash Your Headlights at Another Car in South Dakota?

According to the site, there is no specific law allowing or prohibiting headlight flashing. While this may seem like a ringing endorsement for headlight flashing, it’s more likely a much more vague law in the eyes of law enforcement. If the police believe your headlight flashing is impairing other drivers (or even yourself) from your duties on the roadway, you could still be cited.