A board of supervisors may, acting separately or in conjunction with State or Federal agencies, or with another county, burn or remove debris, rubbish, brush, and grass from the county highways. When acting in conjunction with other agencies or counties, a board may so act outside its county.

The expense incurred by a county, acting pursuant to this section, shall be paid out of any road fund of the county. When a county is acting in conjunction with another agency or county the share of the expense to be borne by each shall be arrived at by agreement.