1.0 Introduction ..........................................................................................................................................................2 2.0 Relevant Topics in Sound and Acoustics ............................................................................................................... 2.1 Sound...............................................................

A weigh-in-motion (WIM) system has the capability to perform on-site vehicle classifications based on FHWA schema. However, WIM datasets often contain a significant portion of vehicles that could not be classified into any 13 classes by devices. Possible reasons for classifier failing classify these are tailgating, lane changing, traffic congestion, and equipment malfunction. Analysis unclassif...

15. Supplementary Notes Project performed in cooperation with the Texas Department of Transportation and the Federal Highway Administration. 16. Abstract Non-recurring congestion accounts for a significant portion of freeway delay experienced by motorists in both rural and urban areas. Because access to these facilities is controlled by onramps, these can play a major role in minimizing the imp...

15. Supplementary Notes Project performed in cooperation with the Texas Department of Transportation and the Federal Highway Administration. 16. Abstract TxDOT initiated the rigid pavement database project to collect information on the general performance of portland cement concrete (PCC) pavement as well as to collect project-level information on PCC pavement responses and performance. A total...

The issue of truck accidents on urban freeways is a vital concern for both traffic managers and the general public. The passage of the Surface Transportation Assistance Act of 1982 and recently the North American Free Trade Agreement has increased the numbers of large combination vehicles on the highway system. The rise in truck volume (defined as vehicles exceeding 4.5 Mg (10,000 lbs), the int...

37 INTRODUCTION As drivers age, the skills necessary for safe driving, such as vision, reflexes, flexibility, hearing and reaction time, begin to deteriorate. To cope with these changes, many drivers choose to adjust their driving habits as a means of retaining their mobility. Adjusting driving habits is one part of the puzzle; improvements to the roadway environment can be another. Traffic eng...

This paper presents a before and after analysis of the impact posted speed limit (PSL) changes on passenger car (FHWA class 2 vehicle) speeds in Portland, Oregon. The study focuses urban roads, comparing sites that underwent PSL 5-mph reduction (treatment sites) where did not change (control sites). Sites with high percentage priority for cyclists (neighborhood greenways) more standard traffic ...

Over the last 30 years, relocation of freshwater mussels has been used as a conservation strategy for potential impacts from bridge construction and dredging operations. Improved methods have effectively increased relocated mussel survivorship rates of target species from ~ 50% to ~ 90% under ideal circumstances. Success to date is largely based upon survivorship rates without consideration of ...

FOREWORD The main objective of this project is to quantify and resolve the differences in the longitudinal profile and roughness indices that are attributable to the different profiling equipment that have been used in the LTPP program. The Long-Term Pavement Performance (LTPP) program was designed as a 20-year study of pavement performance. A major data collection effort at LTPP test sections ...