Related Clues:

• Symptom for a car mechanic
• When repeated, 'Out of the way!'
• Obscenity obscurer, sometimes
• Caller's cue
• It may precede a message
• When repeated, Road Runner's call
• Kin to a honk
• Sign of traffic impatience
• Beetle's warning
• Microwave sound
• Censor's insert
• Refrigerator sound
• Sound happy, maybe
• Sound heard during gridlock
• Part of a city street's cacophony