SAN DIEGO -- This much is not in dispute: Inspectors could not duplicate the sudden, unintended acceleration that a motorist reported last week when his Toyota Prius reached 94 mph on a California freeway. They tried during a two-hour test drive.

Disagreements begin over what that means.

John Gomez, an attorney for the motorist, James Sikes, says it is insignificant and not surprising.

"They have never been able to replicate an incident of sudden acceleration. Mr. Sikes never had a problem in the three years he owned this vehicle," he said Sunday.

But Kurt Bardella, a spokesman for U.S. Rep. Darrell Issa, R-Calif., said the failure to duplicate the stuck accelerator, along with a vehicle design to prevent such occurrences, raises questions about the driver's story.

"We're not saying Mr. Sikes is wrong or that he lied, we're saying that questions have arisen in the investigation," Bardella said.Toyota Motor Corp. planned to announce preliminary findings of its investigation at a news conference Monday in San Diego.

The National Highway Traffic Safety Administration is looking into claims from more than 60 Toyota owners that their vehicles continue to accelerate unexpectedly despite having their vehicles repaired.

Technicians with the NHTSA and Toyota could not duplicate what Sikes said he experienced March 8 on a mountainous but lightly traveled stretch of Interstate 8 east of San Diego, according to a congressional staffer's memo prepared for the House Committee on Oversight and"Every time the technician placed the gas pedal to the floor and the brake pedal to the floor the engine shut off and the car immediately started to slow down," the memo read.

According to the memo, a Toyota official who was at the two-day inspection last week in suburban San Diego explained that an electric motor would "completely seize" if a system to shut off the gas when the brake is pressed fails, and there was no evidence to support that happened.

"In this case, knowing that we are able to push the car around the shop, it does not appear to be feasibly possible, both electronically and mechanically that his gas pedal was stuck to the floor and he was slamming on the brake at the same time," according to the memo.

Toyota has recalled millions of cars because of floor mats that can snag gas pedals or accelerators that can sometimes stick. Sikes' car was covered by the floor mat recall but not the one for sticky accelerators. He later told reporters that he tried to pull on the gas pedal during his harrowing ride, but it didn't "move at all."

The Prius is powered by two electric motor-generators and a small gasoline engine, all connected by transmission gears. A computer, which Toyota calls the "hybrid control computer" determines what combination of motors is needed and which would be most efficient.

Craig Hoff, a professor of mechanical engineering at Kettering University in Flint, Mich., said that for the Prius to accelerate out of control, at least two systems would have to fail simultaneously. They are the sensor signal that tracks the brake and gas pedal positions when the driver presses on them and the hybrid control computers.

"The chance of them both going wrong, plus the fact that the signal is bad, it just seems very, very, very remote," Hoff said. "Could it happen? Statistically, yes. But it just doesn't seem very likely."

Several events usually combine to cause problems with cars, and it's difficult to reproduce them, Hoff said.

"It's going to make it really hard to find, because you've got to line up the multiple effects," he said.

The congressional memo said both the front and rear brakes were worn and damaged by heat, consistent with Sikes saying that he stood on the brake pedal with both feet and was unable to stop the car. But if the fail-safe system worked properly, the brakes wouldn't have been damaged because power would have been cut to the wheels.

Gomez said the best evidence that his client was frantically slamming the brakes is that a California Highway Patrol officer who was giving Sikes instructions over a loudspeaker smelled burning brakes and saw the lights on.

Mercedes-Benz automobiles have always been coveted for their luxury, performance, and, increasingly, style. But safety has always been high on the company's list of priorities, and it is the excuse many a spouse has used to convince their significant other that the premium price for the car of their dreams is worth it. The automaker is a pioneer in technologies like energy-absorbing crumple zones and has also taken the innovations of others to new levels.

The German brand has now brought many of its ideas for future technologies into a single vehicle, the S400 Hybrid-based ESF Safety Concept, which is full of hot air... in a good way.

The front passenger seat airbag uses four internal straps to adjust its size depending on the seating position of the occupant, and it can vary the stiffness of the bag to better match the person's weight. Another inflatable device deploys vertically between the two front seats to help keep heads and extremities from flailing around the cabin and passengers from striking each other if the car rolls over or his hit from the side. Riders in the back get inflatable seatbelts that spread the force of impact to help soften the blow.

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