In addition, the bill would authorize MDOT to contract for roadside mowing, roadside park and rest area maintenance, highway drainage, and other highway operational activities. Under the Act, MDOT is allowed to contract for toilet vault cleaning, pickup and disposal of refuse, pavement surfacing and patching, curb replacement, maintenance of office equipment, and other services. The Department is further authorized to subcontract with county road commissioners, township boards, and municipalities for services performed on State trunk line highways, and may do so without Board approval if the subcontract does not exceed $20,000. The bill would increase that amount to $100,000 per subcontract. The bill specifies that this $100,000 limit would be for total expenditures, including cost overruns and extras. The bill further provides that the dollar amount limits for these highway operational activities would have to be adjusted on February 1 each year, based on the percentage increase or decrease of the Detroit Consumer Price Index for the 12-month State fiscal year, ending the preceding September 30. The adjustment would be determined by multiplying the percentage increase or decrease in the Detroit Consumer Price Index, times the dollar limit provided for these highway operational activities, and adding the product to the dollar limit for the previous year, as adjusted by the bill.