Related Clues:

• Dark yellow
• Be a polite driver, in a way
• Indicate silently
• Beacon
• Fossil container, sometimes
• Stoplight color
• Traffic signal color
• Like the "waves of grain"
• It stops traffic
• 'America the Beautiful' color
• Flag or flare, perhaps
• Wave or wink
• Jewelry resin
• Flag or flare
• Like the song's waves of grain