What is a master key for motor vehicles?

A master key for motor vehicles is defined as a key that can fit multiple vehicle models. This type of key is engineered to operate various locking mechanisms across different vehicle brands or models, allowing locksmiths or authorized personnel to access numerous vehicles without needing a unique key for each one. This can be particularly useful for fleet management or automotive professionals who need to service or manage multiple vehicles efficiently.

The other options describe different types of keys or functionalities but do not align with the definition of a master key. For instance, a key designed for high-security vehicles refers to keys that incorporate advanced security features, while a specific key for a single vehicle pertains to standard keys that are uniquely cut to fit only one particular car. Additionally, keys that unlock only electric vehicles would not apply to the conventional idea of a master key, which encompasses various models rather than being limited to a specific type of vehicle or drivetrain.