Related Clues:

• Cue
• Pair of lamps, maybe
• Be a polite driver, in a way
• Indicate silently
• Beacon
• It stops traffic
• Flag or flare, perhaps
• Wave or wink
• Nod or wink
• Warning notice
• See 35 Down
• Noteworthy
• It hangs out on a street near you
• Cell user's need
• Prepare to turn