Final answer:
Large trucks and buses are dangerous for several reasons including poor maneuverability, the tendency to rollover, and needing longer distances to stop. Cars with crumple zones protect passengers by extending the collision time to reduce impact force. A trailer that bounces up and down slowly is likely to be nearly empty, while plastics in cars improve fuel efficiency.
Step-by-step explanation:
Large trucks and buses are considered dangerous because they exhibit several characteristics that affect their operation on the road. These include: Poor maneuverability and large blind spots, making it difficult for the drivers to quickly respond to road changes or detect vehicles and objects in certain areas around them. They are prone to rollovers due to their high center of gravity, which affects their stability, especially in sharp turns or uneven road conditions. Additionally, they require longer stopping distances compared to smaller vehicles, meaning that they have to start braking earlier to stop safely.
Cars designed with crumple zones help protect passengers by increasing the time of impact, which in turn reduces the force experienced by passengers during a collision. This is because a longer time to absorb the impact force results in a less abrupt stop for the passengers.