Illinois Department of Transportation, Erica Borggren, Acting Secretary
Patrick J. Quinn, Governor
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Part I Noise Fundamentals

Part II Noise Analysis

Part III Noise Abatement

Frequently Asked Questions

Glossary and Acronyms

Traffic Composition

•  Automobiles

-          Two axles

-          Four tires

-          Transportation of nine or fewer passengers

-          Less than 10,000 pounds


•  Medium Trucks

-          Two axles and six wheels

-          Generally designed for transport of cargo

-          Between 10,000 and 26,000 pounds


•  Heavy Trucks

-          More than two axles and six wheels

-          Designed for transportation of cargo

-          Greater than 26,000 pounds

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