Well what vehicles transporting heavy loads have left to do, is to reduce the size of the load within the limits, if it is possible of course.
In general, we can see the real importance and role of overweight heavy haul permits if we take a look at the traffic congestion, the infrastructure damage, as well as at the pavement and bridge damage. I must not forget as well the injuries that heavy haul vehicles have caused.
Thereupon, when overweight vehicles are traveling at a slow speed they can reduce the risk of damage to bridge infrastructure. But regardless that they can lead to traffic congestion. Also, most commonly oversized heavy loads can be extremely wide and every now and then can block multiple traffic lanes.
On the other hand overweight permits are regulating the infrastructure damage. We are all aware of the fact that overweight loads can destroy and damage infrastructure.