Related Clues:

• 'Give it a rest!'
• Sort of sign
• Pull over
• Slowdown cause
• 'Whoa!'
• Terminate
• Layover
• 'Cool it!'
• Flag down
• Grind to a halt
• Telegram "period"
• Tops a different way?
• Octagonal traffic sign
• Call a halt to
• "Freeze!"