A traveler stretching an arm into New York City traffic for a taxi is quite often young, male and relatively affluent.

When the passenger slides into the back seat, there is a less than 6 percent chance that the driver on the other side of the partition was born in the United States.

And as the cab wades back into a busy avenue, there is a nearly two-in-three chance that the rider will opt not to use the seatbelt.

“Apparently all the hectoring from the taxi screen has not been enough,” said David S. Yassky, the city’s departing taxi commissioner and star of back-seat public service announcements imploring riders to buckle up.