Which of the following is a key responsibility of IDOT?

The maintenance of state highways and bridges is indeed a fundamental responsibility of the Illinois Department of Transportation (IDOT). This role involves ensuring that the state's transportation infrastructure is safe and functional for public use. IDOT is tasked with overseeing the construction, repair, and general upkeep of highways and bridges, which are crucial for facilitating transportation and supporting economic activity across Illinois.

While the organization may collaborate with other agencies regarding road safety and transportation policies, its direct mandate focuses on infrastructure rather than health assessments, driver’s licenses, or air traffic control. These responsibilities fall under different government agencies or departments, highlighting IDOT's specific focus on ground transportation infrastructure. Therefore, the emphasis on maintenance is crucial in keeping the entire state connected and is a primary function of IDOT's mission.