Before revision: Machine-mediated parts movement, and freedom from wind and rain can improve construction safety Disadvantages Transportation costs may be higher for voluminous prefabricated sections than for their constituent materials, which can often be packed more densely .
After revision: (especially sections so big that they constitute oversize loads requiring special signage, escort vehicles, and temporary road closures)and are more likely to fit onto standard-sized vehiclesMachine-mediated parts movement, and freedom from wind and rain can improve construction safety Disadvantages Transportation costs may be higher for voluminous prefabricated sections than for their constituent materials, which can often be packed more densely .