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Trucks and buses are equipped with two types of horns: air-powered klaxons and electric horns. Air-powered klaxons are activated by an air-pressure valve lever on the dashboard or by an outstretched hand. Drivers use the horn to signal other motorists and to make themselves heard. Air-powered klaxons are more difficult to install and are usually …

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Police vehicles vary in appearance and purpose. Some are equipped for specific operations, such as responding to traffic accidents. Patrol cars are often marked with the agency logo, a police seal, and emblems. Some police vehicles also sport a flashing siren and other equipment. Some vehicles are specially modified to better reflect light. The police …

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