A year-long government investigation uncovered no electronic flaws that would lead to the sudden acceleration of Toyota vehicles.
NASA computer experts looked at miles of software code, and say there is nothing that would cause unintended acceleration.
The study concluded there are just two problems that could cause throttle pedals to stick:
- floormats that trap the gas pedal
- sticky pedals that are too slow to release
We may never know if what caused a Toyota Avalon to crash into an icy Southlake pond in December 2009, killing all four people in the sedan.
Investigators ruled the cause of the crash as "inconclusive."
Transportation officials are considering some new requirements for all passenger vehicles, including:
- brake override systems
- keyless ignition systems
- event recorders like the "black boxes" in aircraft