Related Clues:

• They may be locked
• Warning sound
• Some people lock them
• Short blast
• Sweetums
• Choo-choo's sound
• Caller's prompt
• They're often hit in rush-hour traffic
• Alert electronically
• Palindromic horn sound
• Drinking binge
• Brass section
• Train whistle sound
• Car alarm?
• Taxi tooters