No fire apparatus equipped to carry firemen on the outside of the vehicle on the sides, or rear, or both, shall be operated without first installing on the fire apparatus on the sides and rear thereof a sufficient number of safety belts and safety belt connections to protect the maximum number of firemen who can occupy the sides and rear of the apparatus while responding to fire alarms.  The city shall cause inspection of the safety equipment at least semiannually.
(ILCS Ch. 625, Act 5, § 12-706)  Penalty, see § 70.999