The limitations of Code Section 32-6-23 as to width and of Code Section 32-6-24 as to length shall not apply to the following loads and vehicles, which may exceed such limitation without a permit: farming or agricultural equipment or forest management equipment, whether self-propelled or being hauled, when such vehicle or equipment is being operated during daylight hours upon a public road not part of The Dwight D. Eisenhower System of Interstate and Defense Highways by dealers or by the owner thereof or his agent within a radius of 40 miles of the property of the dealer or owner. The foregoing exemptions do not apply to vehicles hauling or transporting forest products.