The Association's prime objective is to promote, protect, and improve the transportation industry thoughout the state of Illinois. Our success is shared equally by all contractors and designers, regardless of their specialty. The IRTBA provides a single voice for the transportation construction industry to influence the legislative and executive brances of government. We are also a service organization, providing information and networking opportunities to your business. Some of our 400 member firms include:         Contractors         Planning & Design Consultants         Associate Members in Insurance, Banking, Marketing, etc. Learn about our membership benefits.