Large trucks, including semi trucks and other commercial trucks, are central to commerce in America. They routinely travel on all California roadways. While trucks are familiar sights on the road, they present uncommon dangers to other drivers and bystanders. They generally have less visibility than other vehicles, and have slower braking response and a more limited ability to avoid accidents.
But most significantly, trucks are massive. A semi truck cab alone can weigh up to ten tons, and with a loaded trailer it can weigh several times that amount. A regular passenger vehicle, on the other hand, typically weighs between 1-2 tons.