There are two kinds of shipments in transportations.
One is called Container Vessel Shipping and the other one is called Ro-Ro Vessel Shipping.

What is Container Vessel Shipping?

Container Vessel Shipping is much cheaper if you have many vehicles to send.
For example, in a 40ft container, you can load up to 6 cars of Kia Morning, Daewoo Matiz, etc.

What is Ro-Ro Vessel Shipping?

Ro-Ro Vessel Shipping is a type of shipping method when you have short number of cars to send.
Its weight is calculated by CBM. CBM is an equation of cubic meter, m3.
This method is used in an International shipping business to measure the volume of the cargo.