Restriction on number of abnormal indivisible loads
5.  No motor vehicle or motor vehicle and trailer shall carry more than one abnormal indivisible load at any one time:
Provided that if the weight transmitted to the road surface by the motor vehicle or the motor vehicle and trailer does not exceed the weights prescribed in the Rules it shall be permissible to carry more than one abnormal indivisible load of the same character or other articles of a similar character in addition to the abnormal indivisible load or loads.