IIHS: Speeders Are More Likely to Be on Their Cellphones Too

Why It Matters

The overlap of speeding and distracted driving amplifies crash risk, challenging the assumption that phone use is confined to slower traffic and prompting tighter enforcement and technology solutions.

Key Takeaways

• Speeding drivers 12% more likely to use phones per 5 mph
• Phone use rises 3% per 5 mph on arterial roads
• Highest speed limits show strongest link between speeding and distraction
• Distracted‑driving citations jumped 20% in California in 2024
• Study analyzed ~600,000 trips from July‑Oct 2024 across U.S.

Pulse Analysis

The IIHS analysis, powered by data from Cambridge Mobile Telemetry, reveals a clear dose‑response relationship between speed and cellphone manipulation. By tracking nearly 600,000 anonymized trips, researchers observed that each 5 mph increment above the posted limit adds a measurable uptick in phone‑handling time, especially on free‑flowing, limited‑access highways. This granular insight overturns the long‑held belief that drivers only reach for their devices at lower speeds, highlighting a hidden layer of risk that traditional traffic‑safety models have missed.

From a policy perspective, the findings suggest that enforcement strategies must evolve beyond speed‑only tickets. Law‑enforcement agencies, like the California Highway Patrol, have already reported a 20% rise in distracted‑driving citations for 2024, indicating growing scrutiny. Meanwhile, insurers and telematics providers can leverage these patterns to refine risk scores, offering incentives for drivers who maintain both speed compliance and reduced phone interaction. Emerging in‑vehicle technologies—such as hands‑free voice assistants and AI‑driven distraction alerts—could mitigate the compounded danger, especially on high‑speed corridors where the correlation is strongest.

The broader behavioral context points to a cultural shift: despite near‑universal acknowledgment that texting or scrolling while driving is unsafe, nearly nine‑in‑ten motorists report an increase in risky habits over the past year. Stressors like rush‑hour congestion and perceived low traffic density may embolden drivers to multitask. Addressing this issue will require a blend of education, stricter penalties, and smarter vehicle interfaces that discourage phone use without compromising connectivity. As speed and distraction converge, the road safety community faces a critical opportunity to redesign interventions that protect drivers across all speed regimes.