1. Update on Results of Long- term Traffic Noise Measurements for Pavement Overlay Projects James A. Reyff Illingworth & Rodkin, Inc. 2006 Summer Meeting TRB ACD40 Williamsburg, VA

2. Study Results Summarized I-80 Davis OGAC – 8 years State Route 138, Los Angeles County – 3+ years ADOT Pilot Studies – 2+ years

3. I-80 Pavement Project Location: I-80 just east of Davis and west of Sacramento, CA Traffic: 1998 -120,000 ADT (almost 10% trucks) 2004 -135,000 ADT Existing - Aged AC surfacing DGAC (60mm) applied in June 1998 OGAC (25 mm) applied in July 1998

4. I-80 Environment

5. Existing AC Pavement

6. 6 Year Old OGAC

7. I-80 Davis 8yr Findings

8. I-80 Davis 7yr Findings Seasonal Effect

9. I-80 Davis 8yr Findings Calculated Reduction from Baseline

10. I-80 Davis 8yr Findings Tire/Pavement Sound Intensity

11. Frequency Spectra – 20m 7 Year Baseline

12. Frequency Spectra – 145m 8 Year Baseline DOWNWIND UPWIND 8 Year Baseline

13. LA 138 Pavement Research Research Site est. 2002 Two Measurement Techniques –Statistical Passby –Onboard Tire/Pavement Sound Intensity 5 Pavements types –DGAC –Thick OGAC (75mm) –Thin OGAC (30mm) –RAC –BWC

14. LA 138 Results Initial results documented by Volpe and Caltrans (Illingworth & Rodkin) Initial levels up to 4 dBA lower than DGAC with Thick OGAC and RAC quietest Regular testing of Tire/pavement sound intensity – spring and fall

15. LA 138 Results

16. SI Level – Eastbound SR 138

17. Results of the Arizona Quiet Pavement Program – Sites 3D and 3E

18. Site 3D – AZ Route 202 Random Transverse Tined PCC ARFC

19. 250ft x 5ft 50ft x 12ft & 5ft 100ft x 5ft Site 3D Measurements

20. Site 3D Results – Leq

21. 3D Results – Normalized for Traffic Position MeasuredModeled Change PrePostPrePost 50 ft/12ft 84.370.975.174.1 -12.4 50ft / 5ft 83.270.975.274.2 -11.3 100ft / 5ft 76.865.672.871.8 -10.1 250ft / 5ft 68.959.768.066.9 -8.1

22. 3D Results – Leq Data

23. Site 3E – AZ Route 101 Uniform Transverse Tined PCC ARFC

24. Site 3E – Measurements 100ft x 5ft 50ft x 12ft & 5ft 100ft x 5ft

25. Site 3E Results – Leq

26. 3E Results – Normalized for Traffic Position MeasuredModeled Change PrePostPrePost 50 ft/12ft 84.274.980.279.8 -9.0 50ft / 5ft 81.673.279.979.8 -8.3 100ft / 5ft 78.669.876.976.8 -8.7

27. 3E Results – Leq Data

28. Sound Level vs. Distance Measured PCC and ARFC

29. Sound Level vs. Distance Measured and Modeled

30. 250ft x 5ft 50ft x 12ft & 5ft 100ft x 5ft Site 3D Measurements

31. Equivalent Noise Barrier Performance Site at 100 ft Measured Noise Reduction Noise Barrier Height Site 3D10 dBA3.6m (12 ft) Site 3E9 dBA3.0m (10 ft)

32. I-280 San Mateo Existing PCC surface PCC and Rubberized Open Grade Onboard Tire/Pavement Sound Intensity

33. Initial Results for I-280

34. Results for I-280 after 3 yrs RAC (O)