Utah 0.05 Percent Alcohol Driving Limit

Lowering the legal limit to 0.05 percent in Utah is linked to a 9 percent drop in alcohol-related crashes.

Updated on Oct. 27, 2026 in Substance Abuse

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Do you believe stricter blood alcohol limits for drivers effectively improve overall community safety?

In 2018, Utah became the only state in the U.S. to lower its legal blood alcohol concentration limit for drivers from 0.08 percent to 0.05 percent. New data shows that alcohol-related crashes in the state dropped by nearly 9 percent in the four years following this policy change.

Why it matters

The change directly addresses physical impairments, such as reduced depth perception and slower reaction times, that occur at a 0.05 percent blood alcohol level. By lowering the limit, Utah aimed to curb hazardous driving conditions that contribute to serious traffic injuries.

A retrospective analysis of crash data compared Utah to Arizona, Colorado, and Idaho over four years. Researchers found that alcohol-related crashes fell by 9 percent and injury crashes by 12 percent, though pandemic-related factors complicate the total impact.

The players

Insurance Institute for Highway Safety

An independent, nonprofit scientific and educational organization dedicated to reducing the losses from motor vehicle crashes.

National Transportation Safety Board

The independent U.S. government investigative agency responsible for civil transportation accident investigation and safety recommendations.

The details

At a 0.05 percent blood alcohol concentration, drivers begin to experience measurable declines in critical operating skills. Specifically, this level is associated with hindered depth perception and increased reaction time, both of which are essential for emergency braking and distance judgment. While the policy was designed to mitigate these risks, researchers noted that external factors, including a 6 percent average increase in alcohol-involved crashes during a 34-month pandemic period, influenced regional safety outcomes.

2005: The federal government standardized the 0.08 percent blood alcohol limit.
2013: The National Transportation Safety Board recommended a 0.05 percent limit.
2018: Utah officially implemented the 0.05 percent legal threshold.
March-May 2020: Alcohol-involved crashes in Utah rose by 46 percent.

Health Landscape

Utah's adoption of a 0.05 percent limit represents a notable departure from the national 0.08 percent standard established by federal highway funding mandates in 2005. The move aligns with long-standing guidance from the National Transportation Safety Board aimed at further reducing traffic fatalities.

This policy highlights how even moderate amounts of alcohol affect the brain's ability to process space and timing behind the wheel. Recognizing that impairment begins well before legal thresholds is a key safety practice worth discussing with your physician during routine wellness visits.

The takeaway

Even at low levels, alcohol can meaningfully degrade the depth perception and reaction speeds required for safe driving. Drivers should track their intake and prioritize alternative transportation options whenever consuming any amount of alcohol to ensure optimal alertness.