Final answer:
Going slower than other cars or stopping suddenly may cause traffic accidents because it can catch other drivers off-guard. Car safety engineering like crumple zones increase the time of impact during accidents to protect passengers. Fuel efficiency advancements in cars are not directly related to the immediate question.
Step-by-step explanation:
Going slower than other cars or stopping all of a sudden may cause traffic accidents. This is because such actions can be unpredictable to other drivers and may not give them enough time to react safely, potentially leading to collisions. Modern vehicles are equipped with crumple zones which help protect passengers during an accident by increasing the time of impact, thereby reducing the force felt by the passengers (option a). This is an application of physics in real-world safety engineering. While cars are becoming more fuel efficient, this does not directly relate to the question at hand.
Going slower than other cars or stopping all of a sudden may cause traffic accidents. When a driver goes slower than other cars, it can result in frustrated drivers behind them who may attempt risky maneuvers to pass. Additionally, sudden stops can catch other drivers off guard and lead to rear-end collisions. Therefore, it is important to maintain a safe and consistent speed on the road to ensure road safety.