How many positions do most cars' ignition switches possess?

Most cars' ignition switches typically have four positions, which are designed to control the operation of the vehicle's electrical systems and engine start function. The positions are generally as follows:

1. Off: This position completely cuts off electrical power from the ignition and accessories.

2. Accessory: In this position, electrical power is provided to accessories such as the radio and dashboard lights without the engine running.

3. On: This position powers the vehicle's ignition system and allows for normal operation of the engine when the key is turned further to the start position.

4. Start: This position engages the starter motor to crank the engine and start it. Once the engine is running, the key is released, which returns it to the "On" position.

Understanding these positions is crucial for safely operating a vehicle and recognizing how the ignition switch interacts with various systems. This knowledge is especially important for a commercial driver, as it ensures proper handling of the vehicle.