Download or read book An Analysis of Urban Freeway Operations and Modifications written by Darrell W. Borchardt and published by . This book was released on 1984 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: Use of auxiliary lanes in San Antonio, ramp reversal in Houston, grade separated ramps in San Antonio.

Download or read book An Analysis of Real time Control Measures for Calculating Urban Freeway Operation written by Roy Clyde Loutzenheiser and published by . This book was released on 1972 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Freeway Modifications to Increase Traffic Flow written by William R. McCasland and published by . This book was released on 1980 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: The manager of a freeway system has several objectives: provide a transportation system adequate to serve the needs of the area; operate the system in an effective and safe manner; and provide a system that is cost effective to install, operate, and maintain. The modifications discussed in this survey address all of these objectives. Because the modifications are usually declared temporary measures, their applications should be clearly defined in scope and intention. The types of problems addressed by these modifications include the following: overloading of the right lane; bypassing mainline queues; freeway bottlenecks; merge conflicts; preferential high occupancy vehicle operation; and maintenance and construction sites.

Download or read book An analysis of real time contorl measures for calculating urban freeway operation written by and published by . This book was released on 1972 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Federally Coordinated Program of Highway Research Development and Technology Annual Progress Report Fiscal Year 1985 written by and published by . This book was released on 1986 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Developing Crash Modification Factors for Operational Parameters on Urban Freeways written by Eugene Vida Maina and published by . This book was released on 2013 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studies have shown that, roadway safety has become an intensively investigated topic with the objective of improved understanding of the factors that cause crashes to occur. However, it has been shown that as traffic volumes continue to increase across the United States, 52% of drivers feel less safe on the roads today more than they did five years ago and that the American public feels that traffic safety is a serious problem that needs both the government and media to pay more attention to this issue. In response to these public and driver grievances, State and National transportation agencies have been and continue to pursue and understand the causes and solutions that would significantly reduce roadway crash frequencies. At national level, through various and rigorous studies, the American Association of State Highway and Transportation Officials, AASHTO has published the Highway Safety Manual to quantify safety using predictive models and CMFs. Various efforts have been attempted at state level too, for example, Texas DOT has developed an Interim Roadway Safety Design Workbook that describes the relationship between various roadway elements and each element influences roadway safety. In an effort to contribute towards understanding and resolving the factors that influence crash frequencies on roadways, through a thorough literature search. This study realizes that although there has been vast research in this area, no study has explicitly explained why there is variation in crash frequencies on roadways segments with similar physical/geometric features and annual average daily traffic (AADT). Studies suggest that these variations are due to volume changes throughout the day, an effect literature shows that can only be addressed by hourly volumes and not AADT. Driven by these literature conclusions, this dissertation develops crash modification factors (CMFs) for urban freeways by considering level of service (LOS) deterioration due to change in hourly traffic volumes. Here, this study investigates LOS when it deteriorated from A to B, B to C, C to D, D to E and E to F using hourly volume and hourly crash data collected on urban freeway segments, specifically routes US 1, NJ 3 and NJ 21 in the State of New Jersey. Data were collected on 14 miles of urban freeway segments and 1344 hours of traffic volume count and crash data were analyzed for a period of four years, 2008, 2009, 2010, and 2011. Results from this investigation, shows that operational elements have some influence on urban freeway safety. This dissertation shows that as LOS deteriorated from A to B, B to C, C to D, D to E and E to F, the estimated CMFs were 0.673, 1.110, 0.865, 1.452, and 0.370 respectively. These findings concur with those referred to in this dissertation’s literature review findings, which showed that by adding capacity, that is, by reducing congestion initially results in safety improvement that diminishes as congestion increases.

Download or read book Federally Coordinated Program of Highway Research Development and Technology written by and published by . This book was released on 1983 with total page 838 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Use of Shoulders and Narrow Lanes to Increase Freeway Capacity written by J. E. Curren and published by Transportation Research Board. This book was released on 1995 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Report written by and published by . This book was released on 1964 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Policy on Design Standards interstate System written by and published by Aashto. This book was released on 2005 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of Methods for Freeway Operational Analysis written by Catherine C. McGhee and published by . This book was released on 2001 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ability to estimate accurately the operational performance of roadway segments has become increasingly critical as we move from a period of new construction into one of operations, maintenance, and, in some cases, reconstruction. In addition to maintaining flow on our existing roadways, we are faced daily with issues of allocating funds to maintenance activities that will ensure the roadways continue to serve the needs into the future. This includes identifying needs for expansion, additional freeway interchanges, and changes in operational strategies, including HOV lanes or other lane restrictions designed to facilitate efficient traffic flow. Limitations on available funding make up-front analysis of alternative improvement strategies even more important. Traditional methods of analysis such as those provided in the Highway Capacity Manual were not designed to address many of the issues that are commonly faced today. In response, traffic engineering professionals have begun to employ more advanced tools for operational analysis. These tools often involve simulation models that provide very detailed measures of performance based on detailed user input. Based on the experiences of the Virginia Department of Transportation with respect to simulation models and the results of studies documented in the literature, basic guidelines are presented for the use of simulation analysis for freeways in Virginia. Several models we found to provide reasonable results in particular situations. It is, therefore, critical to identify the characteristics of the network to be analyzed and select the best tool based on these characteristics.

Download or read book HRIS Abstracts written by and published by . This book was released on 1989 with total page 1072 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Urban Freeway Surveillance and Control written by Paul F. Everall and published by . This book was released on 1972 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes freeway conditions which are subject to improvement by means of electronic surveillance and control. Ramp metering is presented along with a benefit-cost analysis of its effectiveness.

Download or read book I 295 Barney Circle Freeway Modification Study written by and published by . This book was released on 1984 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Operation Feasibility Analysis of Freeway Diversion at Urban Network written by Hojun Son and published by . This book was released on 2004 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of Minor Freeway Modifications written by Janet A. Nordstrom and published by . This book was released on 1983 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study examinies three types of relatively minor freeway improvements (ramp additions, ramp relocations and grade-separated ramps) to determine the magnitude of road user benefits accrued. Total benefits were broken down into primary and secondary benefits. Primary benefits are those that accrue to the original target group of vehicles. Secondary benefits are those incidental to the improved conditions (e.g. improved intersection operation when ramp vehicles are eliminated). Delay and travel time data were collected at the site of the ramp additions. Volumes at the new ramp were higher than expected, indicating a latent demand. Annual primary benefits of $162,000 accrued to the users of the new ramps. Secondary benefits in improved upstream intersection operations yielded $7,000 annually. No significant change in accidents resulted. An exit ramp was relocated to eliminate queues onto the main lanes. Main lane conditions improved to produce $10,750 in primary benefits. Becuase the relocation allowed better lane distribution at the downstram intersection, secondary benefits of $34,500 accrued. Accidents were reduced, but not significantly. A grade-separated ramp was constructed to provide new access between arterials that are too closely spaced for at-grade entrance and exit ramps. An annual savings of $143,000 accrued to the users of the new ramp. Because this study was based on historical data, no analysis of secondary benefits was possible. The improvement reduced the accident rate, but not siginificantly.

Download or read book Highway Safety Literature written by and published by . This book was released on 1972 with total page 820 pages. Available in PDF, EPUB and Kindle. Book excerpt: