Why is it dangerous to cut in front of a semi-truck too quickly?

Cutting in front of a semi-truck too quickly is dangerous primarily because these large vehicles are significantly heavier than standard passenger cars. This weight affects their ability to stop in a timely manner. A semi-truck requires a much longer distance to come to a complete stop, especially if it is traveling at a high speed.

If a driver cuts in front of a semi-truck abruptly, the truck driver may not have enough time or distance to react adequately and slow down. The inertia of the semi-truck means that even if the driver applies the brakes, it could take much longer for the vehicle to decelerate compared to a lighter vehicle. This creates a risk of a collision if the truck is too close behind when the maneuver occurs.

In contrast, while the other choices touch on aspects related to the dynamics of driving around trucks, the core issue is the stopping distance required by the truck, making option B the best explanation for why cutting in front of a semi-truck too quickly is particularly dangerous.