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Author: Qingyong Yu Publisher: ISBN: Category : Languages : en Pages :
Book Description
The primary contribution of this dissertation is the development of analytical relationships to determine the upstream and downstream boundary points that define the transition between basis tow-lane highway segments and the effective influence area of the signalized intersection and the TWSC intersection, as well as the corresponding method for calculation of an overall facility service measure based upon percent time-delayed and then translating it to a Level Of Service (LOS) grade. The dissertation focuses the efforts on developing the methodology for operational analysis of a two-lane highway with an isolated signalized intersection at the facility level. Nonetheless, this research also provides a model for the basic structure of a facility-level analysis that will be amenable to the incorporation of a variety of segment types. Finally the methodology has been incorporated into the existing HIGHPLAN software program.
Author: Qingyong Yu Publisher: ISBN: Category : Languages : en Pages :
Book Description
The primary contribution of this dissertation is the development of analytical relationships to determine the upstream and downstream boundary points that define the transition between basis tow-lane highway segments and the effective influence area of the signalized intersection and the TWSC intersection, as well as the corresponding method for calculation of an overall facility service measure based upon percent time-delayed and then translating it to a Level Of Service (LOS) grade. The dissertation focuses the efforts on developing the methodology for operational analysis of a two-lane highway with an isolated signalized intersection at the facility level. Nonetheless, this research also provides a model for the basic structure of a facility-level analysis that will be amenable to the incorporation of a variety of segment types. Finally the methodology has been incorporated into the existing HIGHPLAN software program.
Author: Jessica Lora Morriss Publisher: ISBN: Category : Languages : en Pages :
Book Description
ABSTRACT: The concept of level of service (LOS) is central to the Highway Capacity Manual (HCM) and is used to assess the performance of all types of roadway facilities. Many transportation infrastructure funding decisions are based on LOS analyses and the resulting LOS designations are intended to represent user perceived quality of service. This paper provides an overview of the evolution of the two-lane highway LOS analysis methodology and identifies weaknesses in the methodology as perceived by the Florida Department of Transportation (FDOT), as well as other HCM users. In particular, this study focuses on deficiencies in the methodology (in terms of performance measures, LOS thresholds and service volumes) with respect to rural developed two-lane highways, such as those facilities through small towns or developed coastal areas.
Author: Terrel Shaw Publisher: Transportation Research Board ISBN: 030906953X Category : Roads Languages : en Pages : 66
Book Description
The Transportation Research Board's National Cooperative Highway Research Program (NCHRP) Synthesis 311: Performance Measures of Operational Effectiveness for Highway Segments and Systems examines the use of performance measures for the monitoring and operational management of highway segments and systems.
Author: Robert E. Brydia Publisher: ISBN: Category : Express highways Languages : en Pages : 46
Book Description
The concept of real-time performance measurement analyzes feedback from the operational response to freeway incident conditions and provides a quantitative methodology for assessing the impacts of various operational strategies. The significance of this technique is that it can enhance the efficiency of freeway incident management. Even a small percent reduction in the length of an incident would accrue millions of dollars of time-savings for the affected portion of the roadway. The design and construction of a real-time performance measurement system require an understanding of the performance measures and their application to transportation, a review of the state-of-the-practice in performance measurement, and an experimental design on which to build a prototype system.
Author: Douglas W. Harwood Publisher: ISBN: Category : Roads Languages : en Pages : 112
Book Description
This report is an Informational Guide for highway agencies on the use of low-cost improvements to alleviate operational problems on two-lane highways. The Guide addresses both passing and turning improvements that can be constructed for a lower cost than construction of a continuous four-lane highway. The passing improvements presented in the Guide include passing lanes, climbing lanes, short four-lane sections, turnouts, shoulder driving, and shoulder use sections. The turning improvements included are intersection turn lanes, shoulder bypass lanes, and two-way left-turn lanes. Design and traffic control guidelines presented for these improvements include location and configuration guidelines, geometric design criteria, recommended signing and marking practices, and operational and safety effectiveness estimates.
Author: Fred L. Mannering Publisher: John Wiley & Sons ISBN: 1119723191 Category : Technology & Engineering Languages : en Pages : 418
Book Description
Highly regarded for its clarity and depth of coverage, the bestselling Principles of Highway Engineering and Traffic Analysis provides a comprehensive introduction to the highway-related problems civil engineers encounter every day. Emphasizing practical applications and up-to-date methods, this book prepares students for real-world practice while building the essential knowledge base required of a transportation professional. In-depth coverage of highway engineering and traffic analysis, road vehicle performance, traffic flow and highway capacity, pavement design, travel demand, traffic forecasting, and other essential topics equips students with the understanding they need to analyze and solve the problems facing America’s highway system. This new Seventh Edition features a new e-book format that allows for enhanced pedagogy, with instant access to solutions for selected problems. Coverage focuses exclusively on highway transportation to reflect the dominance of U.S. highway travel and the resulting employment opportunities, while the depth and scope of coverage is designed to prepare students for success on standardized civil engineering exams.
Author: Zachary Sebastian Freedman Publisher: ISBN: Category : Rural roads Languages : en Pages : 174
Book Description
Two-lane highways make up 80% of roads in this country. Rural two-lane highways are unique in they are typically characterized by high-speeds and low volumes. Level-of-service is associated with the proportion of vehicles stuck in platoons, or the percentage of vehicles impeded by a slow-moving vehicle. The Highway Capacity Manual 2000 (HCM 2000) recommends determining the percentage of vehicles stuck in a platoon using a performance measure called Percent Time Spent Following (PTSF). Because PTSF is nearly impossible to measure in the field, the HCM has proposed two methods for estimating its value. However, there are inconsistencies between the two methods. This limitation has led researchers to seek more appropriate performance measures for two-lane highways. When performance on these highways deteriorates to the point of needing an upgrade, the addition of a passing-lane is considered. A passing-lane is an extra lane in one or both directions of travel. The current design standards for passing-lanes (length and frequency) are based on simulation research conducted more than 20 years ago. The purpose of this thesis is to analyze traffic stream characteristics within and around a passing-lane as to improve design standards. Three appropriate performance measures were used to analyze data from two passing-lane sites in Montana. The purpose of this analysis was to determine passing lane effective length. The results showed this value may be greater than 6.6 miles. Lane use within a passing-lane section was also investigated. Traffic counters were placed at pre-determined locations within a passing-lane and data were recorded. Analysis of the data showed that aggressive drivers in the left lane are able to drive at 10 miles-per-hour faster than they were traveling as they entered the three-lane section. Further analysis showed that nearly all passing maneuvers of slower vehicles were conducted in the first 1/2-mile of the passing-lane. This thesis found the most appropriate performance measures for investigating passing-lanes are Percent Followers, Percent Impeded, and Follower Density. Also, the required spacing of passing-lanes on a two-lane highway may be farther than the current standards recommend. Lastly, for the site investigated a 3/4-mile long passing-lane would have been adequate.
Author: Qingyong Yu
Author: Qingyong Yu
Author: Jessica Lora Morriss
Author: Terrel Shaw
Author: 
Author: Robert E. Brydia
Author: Douglas W. Harwood
Author: Scott S. Washburn
Author: Fred L. Mannering
Author: Zachary Sebastian Freedman
Author: Lily Elefteriadou