Illinois Department of Transportation, Erica Borggren, Acting Secretary
Patrick J. Quinn, Governor
Traveling PublicMapsProjectsRoad ClosuresNewsDoing BusinessLetting & BiddingCareers@IDOTGeneral Info

Part I Noise Fundamentals

Part II Noise Analysis

Part III Noise Abatement

Frequently Asked Questions

Glossary and Acronyms

Barrier Length  

A barrier needs to block the view of the receptor to the vehicles using the road. Generally, a barrier should extend 4 times the distance between the end receptor and barrier to be effective.

IDOT Privacy Statement | Illinois Privacy Information | Kids Privacy | Web Accessibility  | FOIA