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Torsion bars are used on a vehicle’s suspension to adjust the height of the vehicle. They were first used by General Motors on light-duty pickup trucks in the 1960s. However, they were phased out by 1963. In its place, coil springs were used in the front. Later, torsion bars were used in passenger cars, E-platform …

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Fire trucks have different types of sirens. Typically, an electronic siren is designed to get attention within 50 to 100 feet of the vehicle. The siren’s volume is highest at close range and gradually decreases as the distance increases. For this reason, a fire truck that uses a 200-watt siren box will need two separate …

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