What new equipment is required on all cars manufactured in 1968 and after?

The correct answer is that all cars manufactured in 1968 and after are required to have an exhaust emission system. This requirement stems from the growing concern over air quality and environmental protection during the late 1960s, which led to the implementation of regulations aimed at reducing vehicle emissions. The establishment of the first federal emissions standards under the Clean Air Act made it essential for vehicles to be equipped with systems designed to minimize harmful emissions released into the atmosphere.

The exhaust emission system is crucial as it captures and treats exhaust gases before they exit the vehicle, thereby reducing pollutants. This technology has evolved significantly since its inception, leading to the modern systems we see today that help cars meet stringent environmental standards.

While modern vehicles often include anti-lock braking systems, air conditioning systems, and navigation systems as standard, those features were not universally required for cars made starting in 1968. Therefore, the focus on exhaust emission systems marks a critical step in automotive manufacturing to ensure public health and environmental protection.