For decades, the 55 mph speed limit has been a defining feature on many American highways — a rule born out of energy crises and safety concerns that shaped driving habits for generations. While much of the country has gradually embraced higher limits to match modern vehicles and roadways, certain stretches have held onto the lower threshold, balancing caution with the demands of everyday travel. Now, with states creating their own laws, this one will change how locals and travelers drive in highways.
No longer 55 mph
That balance is shifting now. Starting this summer, a major interstate loop around a significant Midwestern city will see its speed limit increase to 65 mph. The decision comes after evaluations of road conditions and traffic patterns, aiming to align legal limits more closely with actual driver behavior and improved infrastructure.
This change signals a new phase in how speed is regulated on busy urban highways. As drivers adjust to faster limits, questions around safety, travel efficiency, and enforcement will take center stage — setting the tone for how other regions might approach the new measure going forward.
Speed limit increase in Central Indiana
Central Indiana drivers will see new speed limits on most of Interstate 465 starting July 1. Earlier this year, state lawmakers approved a bill that raises the speed limit on I-465 from 55 to 65 miles per hour, and Gov. Mike Braun signed it into law on May 1. The change is part of a broader group of bills from the 2025 legislative session set to take effect in July.
The reason for the speed limit change is Indiana House Enrolled Act 1461, which mainly focuses on road funding and paves the way for new toll roads across Indiana. The I-465 speed limit increase was added during the bill’s passage through the Indiana Senate. Starting July 1, most of I-465 will have the new 65 mph limit, but there will be some exceptions.
Work zone limit
On the other hand, work zone limits will remain in the I-465/I-69 construction area until work is completed, and variable limits will continue between I-65 and I-70 on the southeast side of Indianapolis. Additionally, the 55 mph limit between 86th and 96th streets on the northwest side will stay due to the current road design.
As for whether anyone actually drives 55 mph on I-465, INDOT data from 2021 shows that over a 13-day period, 96% of the 1.1 million vehicles recorded on a northwest section of I-465 were driving above the 55 mph limit. Despite the raised limits, drivers still need to pay attention in work zones. A 2023 law allows INDOT to use speed cameras in these areas, and drivers caught going 11 mph over the posted limit can face financial penalties.
Changes in other states: Colorado adding cameras to highways
Colorado highways are about to change too. Starting in 2025, speed enforcement cameras will be active on highways and interstates across the state, following a 2023 law. The first cameras have already been installed along Highway 119—the “Diagonal Highway”—between Boulder and Longmont, where construction is underway. The Colorado Department of Transportation (CDOT) and Colorado State Patrol (CSP) announced Monday that both stationary and mobile cameras are part of a pilot program on this stretch. Drivers will get a 30-day grace period with warnings before tickets start rolling out.
The new system is part of the Colorado Speed Enforcement Program, which allows automated enforcement technology as long as drivers are warned by signs placed at least 300 feet before the monitored zones. This setup lets cameras and related systems catch and ticket vehicles speeding—especially in work zones where safety is critical. This could work as a role model for other states to also add cameras to their highways.