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"As directed in 2015 by the 84th Texas Legislature, researchers compared highway noise guidelines in Texas with those in five other states and interviewed officials representing several toll road authorities in Texas. They also measured sound levels behind noise barriers along three toll road sections in Harris County, Dallas County, and Williamson County to compare those measures with predicted levels after noise wall construction."--
Introduction -- Literature search -- Evaluation of alternative test methods -- Evaluation of OBSI Test Parameters -- Demonstration Testing of OBSI Procedure -- Conclusions, recommendations and suggested research -- References -- Attachment -- Appendices.
A description of motor vehicle noise sources and the potential for their control is provided. The report presents an overview of the suggested noise prediction methodology, which is a four step process that includes approximating noise impacts using a nomograph procedure to determine noise levels associated with given traffic and site characteristics; refining these predictions by more accurate representation of design parameters and use of a computer program that is able to plot as well as calculate noise impact; introducing appropriate noise-control options and evaluate them, using a noise barrier nomograph solution; lastly, selected options are fully evaluated using the computer program.