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We still haven't solved the riddle of sudden acceleration

Lately it seems that each day brings another report of a driver's terrifying experience with an out-of-control Toyota. There have been at least four congressional hearings in as many weeks.

Even the most confident consumer has to wonder what is causing all this and, more fundamentally, whether Toyotas are safe to drive.

The second question is easier to answer. Despite the flurry of reports, incidents with speeding vehicles are rare. And vehicles today, including Toyotas, are safer than ever.

While we have heard much recently about "smart pedals," floor mats and sticky throttles, it has not been made clear what is behind the incidents of sudden acceleration. The National Highway Traffic Safety Administration has been investigating sudden vehicle acceleration for a few decades, but it has little new to offer since the 1989 Audi investigation. During that time the agency reported that many incidents of sudden or unintended acceleration by Audi drivers were caused when drivers stepped on the gas instead of the brake.

Ultimately, Audi and other automakers implemented features that required brakes to be depressed when shifting gears out of park, and reports of sudden acceleration dropped.

But as vehicles have become more advanced and, presumably, safer, complaints have still been logged.

As a consumer resource for automotive information, has a stake in finding answers. We also have a data team that crunches numbers, and we have vehicle testers, both of which we recently assigned to help solve the mystery of unintended acceleration.

We assigned 25 staffers to review, line by line, the published consumer complaint data available on the NHTSA Web site. The database, with more than 760,000 records, is, simply put, a mess. After reading each complaint since model year 2005, we found that 30 percent of the original complaints were miscategorized; more than 26 percent were duplicates; and hundreds were not complaints but merely comments or suggestions.

When we focused on the major automakers and limited our review to recent model year vehicles (2005 to present), the 52,000 complaints through September 2009 showed that every car company had incidents of sudden acceleration. This is not strictly a Toyota issue.

Subtract the vehicles covered by the recent recalls and Toyota's volume for the remaining vehicles is actually better than Ford and comparable to General Motors and Chrysler vehicles.

Theories about sudden acceleration broadly fall into four categories: First, some sort of electrical interference or computer glitch. Second, a general mechanical failure, such as a sticky throttle. Third, design factors such as floor mats. Fourth, driver error.

We tried to recreate the circumstances surrounding some recent incidents. We took the highest horsepowered Toyota Camry to the test track to see if the brakes could stop a runaway vehicle — which they can. Next we looked at the Toyota Prius. We found that when the vehicle is accelerating, a simple tap of the transmission shifter into neutral disengages the throttle, and the vehicle coasts to a halt — even if the brakes are not applied.

What does all this mean? As our testing confirms and government regulators and Toyota have said recently, it is extremely difficult to recreate the out-of-control incidents being reported.

So where do we go from here? The Transportation Department and NHTSA should take the lead in coordinating an effort that involves all manufacturers. Perhaps by sharing data, they can find an answer that working individually has rendered elusive.

We need to focus on the right problem. Toyota's embarrassment about communication lapses and likely government regulatory fixes miss the point. Our roads will be safer when the root cause of unintended acceleration is known.

The case for saving property and lives should be obvious. But there is another risk for consumers: Toyota's legal bill for unintended-acceleration cases will be in the billions. Soon, lawyers will realize that other car companies are vulnerable. And who ends up covering this tab? Future car buyers — in higher prices.

Jeremy Anwyl is chief executive of, which recently announced a competition with a cash prize for anyone who can demonstrate in a verifiable manner the reason for unintended acceleration.

We still haven't solved the riddle of sudden acceleration 03/16/10 [Last modified: Tuesday, March 16, 2010 6:47pm]
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