What is the maximum speed limit on Iowa highways unless otherwise posted?

The maximum speed limit on Iowa highways, unless otherwise posted, is 70 mph. This speed limit is designed to promote safe and efficient travel on major roadways while allowing for adequate time to react to potential hazards. It's important for drivers to adhere to this limit as it balances the need for quick transit with safety considerations. In order to ensure everyone's safety on the road, individuals are encouraged to adjust their speed according to driving conditions, traffic, and other factors, but under normal circumstances, 70 mph is the legal maximum.