Download or read book Two lane Highway Work Zone Capacity Model and Control Analysis written by Wenbo Zhu and published by . This book was released on 2015 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lane closure is a common practice for two-lane highway work zones. To effectively control the open lane to serve both travel directions, it is necessary to implement a traffic control strategy. Due to lane closure, the roadway capacity will drop significantly. The remaining capacity will depend on work zone configurations, traffic parameters and traffic control strategy. This study develops a mathematical model calculating capacity and vehicle delay specifically for two-lane highway work zones with pre-timed signal control strategy. A VISSIM simulation model is developed and calibrated using field observed data to validate the mathematical model. After fine tuning the parameters, the mathematical model is able to make reasonably accurate delay estimates for both saturated and under-saturated traffic demands, with mean absolute prediction errors between 1% ~ 3%. Flagger control is incorporated in the VISSIM simulation model using a gap-out distance method. Field observations are used to validate the model outputs. The study then compared flagger control with fixed time signal control under multiple traffic conditions. Results show that at low traffic demands flagger control performs better than fixed time signal control. For the specific work zone site studied, flagger control is able to achieve approximately 10% ~ 20% lower vehicle delay. The developed models and simulation results can be applied to optimize two-lane highway lane-closure work zone management by reducing overall user delay while maintaining adequate roadway capacity. The optimized pre-timed signal control plan can reduce the user delay to a similar level as that of the actuated or flagger control method and thus can be used to avoid the human operation cost. Sensitivity analysis shows that traffic operators can increase the roadway capacity by reducing work zone length, increasing vehicle travel speed, and making unbalanced signal allocation based on actual traffic demands.

Download or read book Impact of Lane Closures on Roadway Capacity written by and published by . This book was released on 2008 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Two lane Highway Traffic Operations written by John R. McLean and published by Taylor & Francis. This book was released on 1989 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: First Published in 1989. Routledge is an imprint of Taylor & Francis, an informa company.

Download or read book Work Zone Lane Closure Analysis Model written by and published by . This book was released on 2009 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Construction Costs and Safety Impacts of Work Zone Traffic Control Strategies written by E. N. Burns and published by . This book was released on 1989 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research was performed to determine total costs (construction and road user costs) and safety impacts associated with traffic control through work zones on rural four-lane, divided highways using single lane closure (SLC) versus two-lane, two-way traffic operations (TLTWO). An informational guide for use in selecting cost-effective traffic control strategies for proposed construction projects was also prepared. Construction data were collected from 51 construction projects in 11 States, and traffic capacity delay studies were conducted at 25 projects in 10 States. Guidelines are presented in this report for selection of the best traffic control alternative between SLC and TLTWO. A simplified procedure to estimate road user costs for SLC and TLTWO traffic control strategies is also included. This guide is Volume II of a two-volume series. Volume I (FHWA-RD-89-209) is the final report.

Download or read book Traffic Control Guidelines for Urban Arterial Work Zones Volume I Executive Summary Final Report written by H. Gene Hawkins and published by . This book was released on 1992 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Planning and Scheduling Work Zone Traffic Control Final Technical Report written by Charles M. Abrams and published by . This book was released on 1980 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Updated Short term Freeway Work Zone Lane Closure Capacity Values written by Raymond A. Krammes and published by . This book was released on 1992 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recommendations on estimating the capacity of short-term freeway work zone lane closures are presented. The recommendations are based upon 45 hours of capacity counts at 33 different work zones between 1987 and 1991. These new data indicate average capacities for short-term freeway work zone lane closures from 3 to 1 lanes and from 2 to 1 lanes that are significantly higher than older values reported in the 1985 Highway Capacity Manual. A base capacity value of 1,600 pcphpl is recommended for all short-term freeway work zone lane closure configurations.

Download or read book Planning and Scheduling Work Zone Traffic Control Technical Report Final Report written by J. J. Wang and published by . This book was released on 1981 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Intelligent Decision Support System for Work Zone Traffic Management and Planning written by Hojjat Adeli and published by . This book was released on 2004 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: Periodic resurfacing, rehabilitation, restoration, and reconstruction work is needed on the aging highway system to maintain a desired level of service for the traveling public. However, temporary work zones on highways disrupt the normal flow of traffic and reduce the level of service. Freeway work zones have become a major source of traffic congestion and travelers' delays which result in reduced freeway capacity, increased driver frustration, increased traffic accidents, increased road user delay cost, and increased fuel consumption and vehicle emissions. In this research, scientific models have been created for estimation of the work zone capacity for the first time. A case-based reasoning (CBR) model has been created for freeway work zone traffic management considering work zone layout, traffic demand, work characteristics, traffic control measures, and mobility impacts. A freeway work zone traffic delay and cost optimization model has been developed in terms of the length of the work zone segment and the starting time of the work zone using average hourly traffic data. An adaptive computational model has been created for estimating the work zone capacity and queue length and delay. A neuro-fuzzy logic model has been developed for estimation of the freeway work zone capacity taking into account 17 different factors impacting the work zone capacity. An object-oriented model has been developed for freeway work zone capacity and queue delay and length estimation. The model has been implemented into an interactive software system, called IntelliZone. IntelliZone's capacity estimation engine is based on pattern recognition and neural network models incorporating a large number of factors impacting the work zone capacity. This research provides the foundation for a new generation of advanced decision support systems for effective management of traffic at work zones. The extensive parametric study of main factors impacting the work zone capacity provides quantitative and objective results of value to work zone engineers and highway agencies when creating traffic management plans for work zones.

Download or read book Freeway Work Zone Lane Capacity written by Alex Drakopoulos and published by . This book was released on 2009 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt: The focus of this report is a capacity analysis of two long-term urban freeway Work Zones. Work Zone #1 tapered four mainline lanes to two, using two separate tapers; Work Zone #2 tapered two mainline lanes to one. Work Zone throughput was analyzed throughout the day over multiple days and traffic operations conditions were analyzed up to a distance of five miles upstream of the Work Zone entrance. Historical data from pavement-embedded detectors were used to analyze traffic conditions. The database consisted of five-minute volume, speed and occupancy data collected from 78 detectors for a total of 50 days. Congestion during each analyzed Work Zone existed for more than fourteen hours each day; Work Zone impacts adversely affected freeway operations over distances of 3.7 to 4.2 miles. Speed and occupancy conditions further upstream were, however, not affected, or even improved due to significant trip diversion. Work Zone capacity was defined based on the maximum traffic flows observed over a one-hour period; throughput values were also compiled over longer periods of time when traffic was within 90% of the maximum observed one-hour flows, as well as over the multi-hour mid-day period. The Highway Capacity Manual freeway capacity definition based on the maximum observed 15-min period was not used, since it would have no practical application in estimating Work Zone throughput when congested conditions prevail for the majority of the hours of the day. Certain noteworthy changes took place for the duration of the analyzed Work Zones: per-lane throughput dropped; morning peak periods started earlier, evening peak periods ended later and lasted longer; mid-day volumes dropped accompanied by the highest occupancies of the day. Trip diversion was evident in lower volumes entering the analyzed freeway corridor, higher volumes using off-ramps and lower volumes using onramps upstream of the Work Zones. The majority of diverted traffic comprised smaller vehicles (vehicles up to 21 feet in length); combination truck volumes increased and their use of the median lane increased, contrary to smaller vehicles that shifted toward a heavier use of the shoulder lane.

Download or read book A Mechanistic Model of Work Zone Capacity written by Changmo Kim and published by . This book was released on 2008 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design Considerations for Two lane Two way Work Zone Operations written by and published by . This book was released on 1983 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: A practice used during long-term construction activities on divided highways is to allow two-lane, two-way traffic operations (TLTWO) on one roadway while the other roadway is completely closed to traffic. Federal, state, and local officials have become increasingly concerned in recent years about safety problems in TLTWO work zones. This report presents the results of operational and accident studies of 36 construction sites employing either two-lane, two-way operations or lane closure traffic control. Project cost information for four TLTWO and ten lane closure sites was also analyzed. Results of the study were divided into four areas: evaluation of centerline treatments on the two-way roadway segment; design of temporary median crossover roadways; comparison of TLTWO and lane closure operations; and general results.

Download or read book Planning and Scheduling Work Zone Traffic Control written by Charles M. Abrams and published by . This book was released on 1980 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Improvement of Planning Level Analysis Procedures for Two lane Highways written by Scott S. Washburn and published by . This book was released on 2005 with total page 772 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of Traffic Controls for Highway Work Zones written by Richard F. Pain and published by . This book was released on 1979 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Planning and Scheduling Work Zone Traffic Control Executive Summary written by J. J. Wang and published by . This book was released on 1980 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: