The NYT reveals the secret undisclosed rush hour taxi signal: "Hold out your thumb and index finger an inch apart, as if a matchstick were in between...It tells them you're only going a short distance." It's just like your usual rush hour tacticjumping up and down while frantically waving your arms while screaming "TAXIIIII!!"but more subtle.
When cabs won't stop, a little pinch may help [NYT]