What is true about the safety of vehicles equipped with a speedometer?

Answer: B — speedometer must be in good working order

The statement that a speedometer must be in good working order is essential for the safe operation of a vehicle. A functional speedometer allows the driver to be aware of their speed at all times, helping to prevent speeding violations and ensuring compliance with posted speed limits. This is crucial for maintaining road safety, as exceeding the speed limit can lead to accidents and endanger the driver, passengers, and others on the road. Regularly checking that the speedometer is functioning properly contributes to safe driving practices, as it assists drivers in making informed decisions regarding their speed. If the speedometer is malfunctioning or inaccurate, it poses a risk not only to the driver but also to other road users, making safe navigation more difficult. In contrast, having a speedometer that is not regularly checked or that is deemed unnecessary is not acceptable, as it can lead to dangerous driving conditions. Therefore, ensuring that the speedometer is always in good working order is a fundamental aspect of vehicle safety.