What is the b on the prius shifter?

The "B" on the Prius shifter stands for "Brake." It is a feature in the Prius that allows the driver to engage an increased level of regenerative braking, which helps to recharge the hybrid battery while slowing down the vehicle.

When the shifter is moved to the "B" position, it activates the regenerative braking system, which uses the electric motor to generate electricity by slowing down the vehicle. This energy is then stored in the hybrid battery for later use. The increased braking effect can be particularly useful during downhill driving or in situations where you need to slow down or stop more quickly.

The "B" position essentially simulates the feeling of engine braking in a traditional gasoline-powered vehicle. It helps to reduce wear on the brake pads and can potentially improve fuel efficiency by maximizing energy recovery. However, it's important to note that using the "B" mode excessively can lead to reduced braking response if the hybrid battery is fully charged or low traction conditions, as the regenerative braking relies on the electric motor to slow down the vehicle.

Overall, the "B" position on the Prius shifter offers a more aggressive regenerative braking experience, allowing drivers to better manage their speed and battery charging while driving.