London, Singapore, Stockholm and a few other cities around the world battle heavy traffic with a “congestion charge,” a stiff fee for driving in crowded areas at peak hours. But drivers generally hate the idea, and efforts to impose it in this country have failed.
![]() |
SENSOR Chinmoy Mandayam,
a graduate student at Stanford,
adjusted a solar-powered traffic scanner.
|
Balaji Prabhakar, a professor of computer science at Stanford University, thinks he has a better way.
A few years ago, trapped in an unending traffic jam in Bangalore, India,
he reflected that there was more than one way to get drivers to change
their behavior. Congestion charges are sticks; why not try a carrot?
So this spring, with a $3 million research grant from the federal
Department of Transportation, Stanford deployed a new system designed by
Dr. Prabhakar’s group. Called Capri, for Congestion and Parking Relief Incentives,
it allows people driving to the notoriously traffic-clogged campus to
enter a daily lottery, with a chance to win up to an extra $50 in their
paycheck, just by shifting their commute to off-peak times.
The program has proved so popular that it is to be expanded soon to also cover parking.
Amaya Odiaga, the director of business operations for Stanford’s
physical education department, now drives to campus a few minutes
earlier and says she has won just $15. But a co-worker got $50 —
creating a competitive atmosphere that makes the program fun, Ms. Odiaga
said.
Better yet, Ms. Odiaga’s commute now takes as little as 7 minutes, down from 25 minutes at peak hours.
Dr. Prabhakar is a specialist in designing computer networks and has conducted a variety of experiments
in using incentives to get people to change their behavior in driving,
taking public transit, parking and even adopting a more active
lifestyle. Unlike congestion pricing,
which is mandatory for everyone and usually requires legislation,
“incentives can be started incrementally and are voluntary,” he said.







By Alec Stewart Former England captain and BBC Radio 5 live summariser Venue: Trent BridgeDate: 25-29 MayStart: 11:00 BST dailyCoverage: Ball-by-ball commentary on Test Match Special (BBC 5 live sports extra, BBC Radio 4 LW and available worldwide via BBC Sport website); updates on BBC Radio 5 live; live text commentary on BBC Sport website