Related Clues:

• Instruction at many a corner
• Intersection sign
• Hang it up
• Word on an octagon
• Proctor's call
• 'Give it a rest!'
• Sort of sign
• Pull over
• 'Whoa!'
• Terminate
• Layover
• 'Cool it!'
• Flag down
• Grind to a halt
• Telegram "period"