1. I. Less than 7 rows

   A-I

   B-I

   C-I

   D-I

2. II. 7-8 rows

   A-II

   B-II

   C-II

   D-II

3. III. 9-10 rows

   A-III

   B-III

   C-III

   D-III

4. IV. 11 or more rows

   A-IV

   B-IV

   C-IV

   D-IV

As a basis for determining expenditures upon which allowances shall be computed, 16 classes of school bus fleets for districts are hereby established.

The 16 classes are as shown in the following schedule, wherein capital letters indicate the average number of hours of bus operation per day, and Roman numerals indicate the average size of buses so operated:

Average hours of bus operation per day

A

B

C

D

Average size of buses in number of rows

Less than 4 hours

4-5 hours

6-7 hours

8 or more hours