The Influence of Quieter Pavement & Absorptive Barriers on US 101 in Marin County
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1 The Influence of Quieter Pavement & Absorptive Barriers on US 101 in Marin County Paul R. Donavan Illingworth & Rodkin, Inc. Dana M. Lodico Lodico Acoustics, LLC
2 TAM US 101 Widening Project in Marin County (2007) Addition of HOV lane in each direction, all lanes re-paved with new OGAC Added multi-use path Re-located barrier in southbound direction Added absorption to barriers on both sides
3 Northbound Pre-Project Southbound Northbound Post-Project Southbound
4 Noise Measurements Long term overall sound pressure levels above sound wall along northbound lanes Short term ⅓ octave band sound pressure levels above and 50 ft behind the wall On-board sound intensity (OBSI) tire/pavement noise source levels Purpose was to document overall change in noise level
5 Measurements above the Sound Wall Long & short term microphone locations View from top of wall (July 2009)
6 Measurements 50 ft behind Sound Wall
7 On-Board Sound Intensity Quantify tire/pavement noise source levels AASHTO TP 76 except use of Goodyear Aquatred 3 test tire
8 Comparison of OBSI Results
9 Overall OBSI Levels Pre & Post Project
10 90 Pre & Post Long Term Measurements: Above Northbound Wall 85 Mo Tu We Th Fr Sa Su Noise Level (dba) :00 8:00 8:00 8:00 8:00 Dec 07 Aug 10 8:00 Hour Beginning
11 90 Pre & Post Long Term Measurements: Above Northbound Wall 85 Mo Tu We Th Fr Sa Su Noise Level (dba) :00 8:00 8:00 Average Difference = 6.9 db 8:00 8:00 Dec 07 Aug 10 8:00 Hour Beginning
12 Pre & Post OBSI and Short-Term Wayside Noise Levels 6.2 db 6.9 db 6.9 db 7.1 db
13 Comparison of Wayside & OBSI Spectra Sound Level, dba Tire Noise Sound Intensity Top of Barrier 50ft behind Barrier /3 Octave Band Center Frequency, Hz Pre-Project Dec 07 Post-Project Aug
14 Effect of Added Barrier Absorption Concern by residents of reflected noise from opposite side barrier Led to added sound absorptive facing How necessary was it?
15 Interim Measurement Conditions Mixed pavement (old & new) 4 lanes southbound 5 lanes northbound Southbound wall reconstructed Condition 1 July 2009, northbound wall not absorptive Condition 2 July 2009 September 2009, northbound absorptive
16 Mid & Post Project OBSI Levels Overall Sound Intensity Level, dba Jul/Sep 2009 Aug 2010 Lane 5 Lane 4 Lane 3 Lane 2 Lane 1 Lane 4 Lane 3 Lane 2 Lane 1 Northbound Southbound
17 90 Interim Long Term Measurements: Above Northbound Wall Monday Tuesday Wednesday Thursday 85 Noise Level (dba) :00 10:00 6: :00 10:00 6: :00 10:00 6: :00 Average Difference w/ & w/o Absorptive Treatment 0.0 db Pre-Project Dec 07 Mid-Project Jul 09 Mid-Project Sep 09 Hour Beginning
18 90 Long Term Measurements: Above Northbound Wall Monday Tuesday Wednesday Thursday 85 Noise Level (dba) :00 10:00 6: :00 10:00 6: :00 10:00 6: :00 Pre-Project Dec 07 Mid-Project Jul 09 Mid-Project Sep 09 Post-Project Aug 10 Hour Beginning
19 Comparison of Wayside & OBSI Spectra Sound Level, dba Tire Noise Sound Intensity Top of Barrier 50ft behind Barrier /3 Octave Band Center Frequency, Hz Dec-07 Jul-09 Aug-10
20 Assessing the Effect of Added Absorption Wayside measurements were inconclusive Geometry changes Varying pavement during project phases Analysis approach TNM not directly suitable Applied SoundPLAN 7.0 &1978 FHWA algorithm Confirmed with image sources and standard barrier calculations
21 Typical Cases of Concern Clear view to opposite sound wall Partially shielded view opposite sound wall Partial view to road & opposite sound wall Fully shielded view to opposite sound wall Modeled without a opposite barrier & with a totally reflective barrier Calculated differences with & without opposite barrier using US 101 road geometry
22 Study Area along Northbound Lanes 1000 ft
23 Increase Due to Reflection R18 R17 R16 R15 R14 R13 R12 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R Noise Level Difference, db (Reflective Absorptive)
24 Traditional Barrier Analysis Replace wall reflections with image sources Calculate sum of diffracted, direct, & direct/reflected (images)
25 Spreadsheet Example Results 650 ft from 14 ft barrier & 146 wide freeway Receptor height variable Cases: Image sources become direct All actual & image sources are diffracted No line of sight to opposite wall Increases of 5 db may be possible Given distance & close barrier, levels will be low
26 Attenuation of Absolute Levels Reference Location no influence of reflected sound Shows combined effect of distance from highway & reflections from far wall Reference point is attenuated by 14 db due to near barrier New quieter pavement reduces all points further by about 6 to 7 db
27 Observations & Conclusions Quieter pavement greatest contributor to lower wayside noise levels Direct line-of-sight Behind sound walls Effect of added absorption could not be directly measured (in this case) Effect of added absorption modeled to provide additional reductions of 3 to 5 db for Distant receptors (greater than 500 ft) Elevated receptors Less effect closer in (1 to 2½ db)
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