605 ILCS 5/4-101.15

The Department of Central Management Services shall procure for or in behalf of each State highway employee, without cost to him, public liability insurance protecting him against any liability arising out of his employment to the extent of the insurance policy limits not exceeding $100,000 or include each such employee under a self-insurance plan implemented under Section 405-105 of the Department of Central Management Services Law (20 ILCS 405/405-105).