London congestion charge

The London congestion charge was a road-pricing scheme introduced in February 2003 to address the chronic traffic jam in central London. It treated congestion as a coordination problem: by charging drivers for entering the city, it brought some of the costs they imposed on other road users into their own decisions. Though politically contentious and relatively crude, the charge reduced traffic by almost 20 percent and made it flow more easily, offering a practical example of how prices can coordinate dispersed choices.

Gridlock and the case for a charge

In 2002, central London was close to a perpetual traffic jam. On a typical day, a quarter of a million vehicles entered its eight square miles, competing with a million commuters who traveled by public transportation. The city’s narrow, winding streets were poorly suited to this volume: average traffic speed remained below ten miles an hour and, on bad days, fell to about three. Walking could be faster than driving.

The congestion changed the political debate. Mayor Ken Livingstone, an avowed socialist, became the advocate of a measure that appealed to the logic of capitalist economics: charging people to drive into the center. The scheme drew on the idea of congestion pricing, which had been discussed since the 1920s and was most closely associated in the book with economist William Vickrey. Road space, in this account, is scarce. When drivers use it without paying the full costs their choices impose on others, the price of driving fails to signal the real trade-off.

How the scheme worked

Beginning in February 2003, drivers entering central London between 7 a.m. and 6:30 p.m. had to pay £5. The city installed 230 cameras to record license plates; drivers who failed to pay faced an £80 fine. The plan was projected to raise £180 million a year for investment in public transportation and to reduce congestion by 20 percent.

The charge was intended to make the costs of a journey more apparent to the person choosing to take it. A driver entering a crowded center adds to delays borne by other people, costs that are not reflected when access is free. The toll was an attempt to collect that bill through the driver’s own decision. Its purpose was not simply to penalize driving, but to encourage some people to travel at different times, use public transportation, or otherwise reconsider whether a particular trip was worth its cost.

Resistance and the coordination problem

The proposal faced substantial lobbying opposition, and congestion pricing was especially difficult to sell in the United States. Many people dislike tolls, and rush-hour charges seem particularly unfair to commuters who feel they have little choice about when or how to travel. The prospect that wealthier drivers might pay to move freely while others endured longer journeys sharpened that objection. In a failed effort to introduce congestion pricing on the San Francisco–Oakland Bay Bridge, a study’s authors concluded that voters and politicians had to be convinced that there were literally no alternatives.

That resistance points to the collective problem the charge was designed to address. Each driver has a reason to use a free road at a convenient time, even when the combined choices leave everyone stuck in traffic. A toll changes the calculation by making the shared cost part of each individual decision. The scheme therefore sought not to command every driver’s behavior, but to alter the conditions under which drivers chose among routes and times.

Results and limits

The London plan proved more successful than many noneconomists expected. Traffic fell by almost 20 percent, congestion was significantly reduced, and at least one study found that cars could travel 40 percent faster. Even then, the average speed implied by that improvement was only about eleven miles an hour: the gain was meaningful, but the city’s streets had not become empty or unconstrained.

Some critics worried that the charge had discouraged too much driving. The account distinguishes that concern from the scheme’s actual aim. Congestion pricing was not meant to eliminate cars; an empty highway is not necessarily better than one that is too full. The objective was to improve coordination by bringing the benefits of driving into closer balance with the costs imposed on others. In London, the roads remained full of cars, but those cars moved more easily, and the traffic flow became a better reflection of the value drivers placed on their journeys. For the moment, London traffic was described as wiser.

A practical, imperfect instrument

The London scheme was a blunt version of a more responsive system Vickrey imagined. Under responsive pricing, the charge for a road could vary with traffic conditions, weather, or the vehicle being driven. A broken-down tractor-trailer blocking a route, for example, might raise the price of using it and divert some traffic elsewhere. Traffic sensors and vehicle positioning systems could make such adjustments technologically possible, although the book treats their political prospects as remote and questions whether constantly changing prices would be worth the complexity.

The charge’s significance lies in the contrast between the simplicity of its instrument and the difficult coordination problem it addressed. A single price could not dictate the best choice for every commuter, but it could give people a reason to make different choices. Its early results suggested that a shared road need not be managed solely through orders or left to unpriced competition: a rule that makes external costs visible can help individual decisions produce a more workable collective flow.