Police typically use sound level meters, also known as decibel meters, to check motorcycle noise levels. These handheld devices measure the sound pressure level (SPL) or the intensity of sound in decibels (dB). When checking motorcycle noise levels, officers usually follow these general steps:
Observation: Police officers visually observe a motorcycle that appears to be excessively loud or in violation of noise regulations. They may also respond to noise complaints from residents or witnesses.
Positioning: The officer positions themselves in a suitable location where they can safely and accurately measure the noise emitted by the motorcycle.
Meter placement: The sound level meter is placed in a specified position or at a predetermined distance from the motorcycle. The distance and location may vary depending on local regulations and protocols.
Measurement: The officer activates the sound level meter, and as the motorcycle passes by, the meter captures and measures the noise level produced. The measurement is usually taken at a specified engine speed or under specific test conditions.
Comparison to regulations: The measured noise level is compared to the legal noise limits set by local or state laws. These limits are typically specified in decibels at a certain distance from the source, such as a few feet or meters away.
Enforcement: If the measured noise level exceeds the allowable limit, the officer may issue a citation or take appropriate enforcement action based on local laws. This can include fines, warnings, or, in some cases, vehicle impoundment.
It's important to note that the specific procedures and regulations regarding motorcycle noise enforcement can vary between jurisdictions. Different states or localities may have their own laws and guidelines for noise limits and enforcement practices. Therefore, it's advisable to consult the local traffic laws or contact the relevant law enforcement agency for precise information regarding motorcycle noise enforcement in your area.