Possible Clues:

• How to get to Carnegie Hall, perhaps
• Shout "Taxi!"
• Yell 'Taxi!'
• Seek a ride, in a way
• Yell ''Taxi!''
• Decide not to walk, perhaps
• Cry "Taxi!"
• Wave from the curb, say
• Raise one's hand, perhaps
• Cry ''Taxi!''