Drivers Use Phones More When They Speed, Highway Study Reveals

IIHS study of 600,000 trips finds phone use rises 12% for every 5 mph over speed limit on freeways

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Key Takeaways

Key Takeaways

  • Phone handling jumps 12% for every 5 mph over speed limits on freeways
  • Drivers prove 9% more likely using phones on 70 mph versus 55 mph highways
  • Combined speeding and phone use contributed to 3,275 deaths in 2023 crashes

Your highway confidence might be killing you. New research from the Insurance Institute for Highway Safety demolishes the comforting myth that distracted driving happens mainly in bumper-to-bumper traffic—turns out, phone handling actually increases with speed on freeways.

The finding flips conventional wisdom on its head. Most drivers assume they’re safer multitasking on open highways than in stop-and-go congestion. This counterintuitive behavior creates a deadly combination that challenges everything safety experts thought they knew about distracted driving patterns.

Data Exposes Dangerous Highway Habits

Nearly 600,000 trips reveal phone use spikes with every mile per hour over the limit.

IIHS researchers analyzed driving data from Cambridge Mobile Telematics apps between July and October 2024, tracking when drivers touched their phones while exceeding speed limits across the United States, excluding Alaska, California, Hawaii, and New York. The results paint a troubling picture of highway behavior that contradicts decades of safety assumptions.

Phone handling jumped 12% for every 5 mph over the limit on limited-access freeways. The pattern held strongest on high-speed roads—drivers were 9% more likely to use phones on 70 mph freeways compared to 55 mph ones. Local arterial roads showed only a 3% increase, suggesting the problem intensifies with perceived safety and open road conditions.

IIHS President David Harkey noted the research shows “the opposite” of expected patterns in free-flowing traffic, where perceived safety apparently encourages riskier behavior. This psychological factor may explain why drivers feel emboldened to handle devices at higher speeds.

Deadly Combination Demands New Enforcement

Combined speeding and phone use killed thousands in 2023, requiring joint crackdown strategies.

Distracted driving contributed to 3,275 deaths in fatal crashes during 2023—likely an undercount given reporting challenges. Historical estimates suggest the true toll may exceed 10,000 annually, representing potentially 29% of all traffic fatalities.

Reagan advocates for joint enforcement targeting both violations simultaneously rather than treating them as separate problems. Safety cameras capable of detecting phone use alongside speed monitoring could address the dangerous pairing more effectively than traditional patrol methods that focus on one behavior at a time.

The rush-hour reality check: your morning commute’s perceived efficiency gains from speeding while texting create exponentially higher crash risks than either behavior alone. Highway confidence becomes highway recklessness when combined with digital distraction, transforming open roads into danger zones.

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