Potential answers for "Highway attention-getter"

⭐⭐⭐⭐ TOOT
⭐⭐⭐ NEON
⭐⭐⭐ SOOEY
⭐⭐⭐ OYEZ
⭐⭐⭐ GAVEL
⭐⭐⭐ HARK
⭐⭐⭐ PSST
⭐⭐⭐ AHEM

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Shakespearean "Hush!"   Lead-in to a clarification   ___-a-thon