Related Clues:

• Sleep interrupter, at times
• Lorelei was one
• Loud warning signal
• Outdoor warning
• Mythical temptress
• It'll make you pull over
• Signal to clear the road
• Airport delayer
• Ambulance warning
• Warning to drivers
• London atmosphere
• Visibility obstacle
• Ambulance announcer
• Squad-car sound
• Makeup of some banks