United States Department of Transportation
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Abstract:Joor Road (LA 946) is an Urban 5-lane Portland cement concrete roadway with an annual daily traffic (ADT) of approximately 13,500 with 7 percent
trucks and posted speed of 55 mph. Since being opened to traffic in 2009, residents have been complaining about the high noise levels emanating from the
roadway.
A comprehensive experiment was developed. The experiment consisted of randomly selecting six PCC slabs, three northbound and three southbound, in
the noisy areas. An additional PCC slab was selected in the southbound direction outside of the noisy area to use as a control. In order to determine if
there were any significant differences between this project and another project constructed under the 2006 specifications, four PCC slabs were randomly
selected for evaluation on O’Neal Lane, which was constructed approximately two years after this section of Joor Road. The parameters assessed from
each of eleven slabs were tine depth, tine width, spacing between tines, and randomness of spacing between tines.
Sound level measurements based on the pass by method indicated the sound levels were excessive (82 dBA) when compared to the Louisiana Department
of Transportation and Development’s (DOTD) Highway Traffic Noise Policy of 66 dBA for residential areas. Sound level measurements from the OBSI
assessment also indicated that sound levels generated by the tire/road contact were excessive with values as high as 110.6 dBA.
Tine parameter analysis implied that the sources of excessive noise level emissions were due to excessive tine widths, non-randomness of spacing between
tines, and the spacing intervals between the tines.
Pavement macrotexture values for the north and southbound lanes were generally within the range of 0.5 to 0.8 mm as recommended by Federal Highway
Administration (FHWA).
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