What is the speed limit on interstates in Illinois?

The speed limit on interstates in Illinois is set at 70 mph for most vehicles, including passenger cars and trucks that do not exceed certain weight limitations. This limit is established to ensure safe and efficient travel on these major roadways, which are designed to accommodate higher speeds due to their construction and the flow of traffic. The 70 mph speed limit allows for a balance between efficiency in travel and the safety of all road users. It's important for drivers to be aware of these limits and adjust their speed according to road conditions, weather, and traffic. Other choices reflect speed limits that may apply in different contexts or types of roadways within the state but do not apply to interstates.