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11 Task 6. Document Task 8. Identify Future Research and Analyze Results and Testing Needs The roadside test data were again post-processed in a Potential areas for follow-up research to and application of laboratory. The analysis included an experimental evalua- the truck noise source mapping technique developed in the tion of the spectral content of the measured truck pass- study for further truck testing are identified and presented in bys and the vertical distribution of the noise from truck Chapter 4. sources, as well as statistical assessment for multiple pass- bys. The results of the testing are presented and discussed Task 9. Submit Final Report in Chapter 3. This final report incorporates the interim report material revised according to the NCHRP comments, includes the Task 7. Summarize Key Findings new results for the roadside truck testing, summarizes the key The key findings of the study are summarized and pre- findings of the study, and identifies the future research and sented in the Summary of this report. testing needs.