It is unlawful to operate any motor vehicle on a highway with

A) A valid driver's license
B) Working headlights and taillights
C) A blood alcohol concentration below 0.08%
D) Defective brakes

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Final Answer:

It is unlawful to operate any motor vehicle on a highway with defective brakes. The correct answer is D) Defective brakes.

Explanation:

Safe and functional brakes are crucial for the safe operation of a vehicle, and operating a vehicle with defective brakes poses a significant risk to the driver, passengers, and others on the road.

The other options (A, B, and C) may also be necessary for lawful and safe driving, but defective brakes directly relate to the mechanical safety of the vehicle.

Therefore, the correct answer is D) Defective brakes.

Final answer:

It is illegal to drive a vehicle with defective brakes as they are crucial for road safety. The operational efficiency of brakes is vital in emergency stopping scenarios. Anticipated safety features in future vehicles may prevent operation under certain conditions, like alcohol consumption.

Explanation:

It is unlawful to operate any motor vehicle on a highway with defective brakes. Ensuring that a vehicle's brakes are in good working order is essential for the safety of the driver, passengers, and others on the road. An automobile traveling at a certain speed and needing to stop, like the hypothetical example of a driver traveling at 15 m/s and stopping just short of an intersection, demonstrates the critical nature of functional braking systems. Moreover, with advancements in transportation technology, there are discussions about incorporating health and safety features into self-driving cars and electric vehicles, such as systems that prevent operation if a driver is detected to have consumed too much alcohol.