Impaired Driving Laws Across a Sample of States
Hover a state for its name. Click a state to see its limits, or use "Compare Two States" to view two side by side.
Zero tolerance for underage drivers. Every state sets a much stricter limit for drivers under 21 than for adults. Click a colored state to compare its adult limit with its underage (zero-tolerance) limit. Colors group states into illustrative penalty-severity categories.
Figures are illustrative educational categories, not exact statutes. Laws change — always check your own state's current law.