IC Bus, headquartered in Warrenville, IL, is a wholly-owned subsidiary of Navistar, Inc. The nation's largest integrated manufacturer of school buses, IC Bus is a leader in passenger protection, chassis design, engines and ergonomics. The company is also a leading producer of commercial buses for several markets. All IC Bus™ brand buses are sold, serviced and supported through a renowned dealer network that offers an integrated customer program encompassing parts, training and service.