Before the introduction of Brake Transmission Safety Interlocks (BTSI), it was possible to shift vehicles with automatic transmissions "out of park"— even if the vehicle's engine was off or in accessory mode, the driver's foot was not on the brake, and the key was in the ignition, which often led to vehicle rollaway, particularly with unsupervised children playing in vehicles. BTSI was gradually added to new cars until it was finally required in all vehicles by Model Year 2010. As a result, this type of vehicle rollaway, while possible, is very uncommon. However, vehicle rollaway can still be a problem in vehicles equipped with a keyless ignition or push-button start feature when the vehicle has been turned off and not shifted into park.
What You Need To Know, Now.
When the vehicle is set in motion, a driver may try to jump into the rolling vehicle in an attempt to stop it, only to be injured or run over. Children can also be hurt inside the vehicle, especially if they are unbelted and the vehicle is in motion. Sometimes, the vehicle may end up running over someone else or into other vehicles. Safety equipment such as air bags are not operational when the vehicle is in the Off position.
- All vehicles with automatic transmission and a Park position, manufactured for sale after September 1, 2010, must have BTSI.
- A small but growing number of new vehicles have an automatic Shift-to-Park function which is a safety feature intended to prevent vehicles from accidentally being turned off without Park being engaged. Should the vehicle be turned off before being placed into Park, the vehicle will automatically shift the transmission to the Park position.