(a) Each certified commercial applicator shall be provided by the department with a set of two numbered stickers for each piece of commercial application equipment. These stickers shall be prominently displayed on opposite sides of each piece of such equipment or on opposite sides of each vehicle used in transporting such equipment except however:

1. (1) small pieces of hand held or portable equipment such as two and one-half gallon sprayers or back pack mistblowers do not require such stickers; and
2. (2) noncommercial-type vehicles transporting small quantities of pesticides or portable pesticides equipment are not required to display the stickers if such display will change the rating of the vehicle and thereby limit its access to certain transportation routes normally used.