(a) General rule.--No person shall sell, transport over a public highway, deliver or cause to be delivered or start out to deliver any solid fuel in a lot or lots in amounts exceeding 100 pounds without each lot in each separate compartment of the vehicle or vehicle and trailer being accompanied by a weighmaster's certificate issued by a licensed weighmaster of this Commonwealth. This subsection does not apply when weighing takes place at the point of delivery or sale.
(b) Exception.--This section shall not apply to a producer of solid fuel who furnishes proof, satisfactory to the department or to an inspector of weights and measures, that the solid fuel being transported comes from the producer's own mine, is the producer's own property and is being transported for a purpose other than for sale.