Steering wheel-no driving force
Driving wheel-driving the vehicle.
The first four types: there are four steering wheels in front (there are 1 wheels at both ends of each shaft, that is, 1 shaft has two wheels, so there are four wheels).
Rear eight: there are eight driving wheels at the back (two wheels at both ends of each axle, that is, 1 has four wheels on the axle, so there are two axles, so there are eight wheels). This kind of vehicle is a heavy vehicle with great load capacity, which is often used in construction, transportation and other purposes.
Extended data:
The first four and the last eight drivers are the same as ordinary single drivers, but they are longer in size and easier to drive than trailers or semi-trailers. The main concern is the road conditions, as long as you ensure safe driving.
Because there are many gears on domestic expressways, the process of speeding up and shifting gears is quite complicated. Once the driver of a big truck increases the speed, he seldom changes his mind to slow down. They avoid some obstacles through driving experience and skills, and naturally use few brakes, which is the root cause of hidden dangers.
If you make a mistake, everything will be unpredictable. Overloading and speeding is another reason why trucks are easy to get out of control. So generally speaking, the kinetic energy of overloaded trucks is quite large, and the role of braking is relatively weakened. Coupled with speeding, braking is far greater than its own ability.
Therefore, accidents such as truck brake failure that are often seen appear in this way. Other long-distance heavy truck drivers are inevitably tired and distracted because of long-distance driving. What's more, they doze off while driving, especially when the road is wide and straight, or long downhill, truck drivers are most prone to visual paralysis and cause serious accidents.