Iowa’s Hands-Free Law Shows Promise, But Crash Reduction Numbers Come With a Big Asterisk

A year after Iowa banned handheld phone use while driving, new data suggests drivers are indeed putting down their devices. Nationwide Insurance and Cambridge Mobile Telematics report that phone-related distractions dropped nearly 7 percent across more than 140 million trips analyzed between July 2025 and May 2026.

Handheld calling fell by a similar margin. That sounds like a clear win for road safety. But dig into the numbers, and the story gets a lot fuzzier.

The study claims these behavioral shifts prevented roughly 470 crashes, 210 injuries, three deaths, and over $20 million in losses. Those are eye-catching figures, but they’re not based on actual police reports or verified accident counts. Instead, researchers built a model using historical crash data and federal economic estimates.

When asked about the methodology, CMT admitted the analysis didn’t account for weather, traffic volume, fuel prices, or economic conditions, all factors that can influence driving behavior. They also acknowledged a 20 percent margin of error on that 470-crash figure. That’s a wide swing.

Perhaps the biggest gap is who, exactly, was tracked. CMT analyzed millions of trips, but neither company could say how many unique Iowa drivers were involved or what share of the state’s motorists they represent. Millions of trips don’t necessarily mean a broad, representative sample of drivers.

None of this means the law is a failure. Early state crash data involving electronic distractions looks consistent with an improving trend. But until the methodology and sample size are clearer, the study reads more like a promising indicator than hard proof.