A motor vehicle operated on a highway is required to have which of the following?

A motor vehicle operated on a highway is required to have all the listed items in good working order to ensure both safety and compliance with traffic regulations. Each component plays an essential role in the vehicle's operation and the safety of its occupants as well as other road users.

Having a muffler in good working order is crucial not only to minimize noise pollution but also to ensure that the exhaust system functions correctly, helping to reduce harmful emissions from the vehicle. A faulty muffler can lead to increased noise levels and potential health hazards due to exhaust leaks.

A horn in good working order is important for communication on the road. It allows drivers to alert other road users of their presence or to signal warnings in case of potential hazards. A malfunctioning horn reduces the driver's ability to communicate effectively, which can lead to dangerous situations.

A speedometer in good working order is essential for the driver to maintain appropriate speeds and adhere to speed limits, promoting safe driving practices. It helps the driver to gauge their speed accurately and adjust their driving as needed based on the speed regulations of the area.

Overall, the requirement for all these components ensures that vehicles can operate safely and responsibly on highways, contributing to a safer driving environment for everyone.