Related Clues:

• Sound from an upset driver
• Beetle's sound?
• Jaywalker alert
• Electronic noise
• A message may be left after it
• Answering-machine feature
• Electronic reminder
• Car-horn sound
• Pager noise
• Half of the Road Runner's taunt
• Traffic-jam sound
• Beetle sound
• Answering machine feature
• Sort of signal
• Medical alert?