Traffic Queuing

SWZ: Technology Applications Types of Applications: Queue Warning

Queue warning systems are designed to quickly detect the presence of queues at the work zone and warning approaching motorists that traffic is slowed or stopped ahead. Application guidelines … More

Treating Potential “Back-of-Queue” Safety Hazards (module) (Training)

The purpose of this document is to highlight strategies that can help reduce the work zone congestion that increases back-of-queue crash risk. Studies have shown that rear-end crashes in the advance w… More

Treating Potential Back-of-Queue Safety Hazards (Publication)

Resource Type: Brochures and Fact Sheets

This fact sheet is designed to highlight common pitfalls in estimating potential impacts that can result from implementing a traffic control plan as well as strategies that can help reduce work zone c…More

Utilizing Probe-Vehicle Data for Work Zone Mobility Performance Management (Publication)

Resource Type: Books, Reports, Papers, and Research Articles

The Virginia Department of Transportation (VDOT) uses probe vehicle data from different sources to measure highway system mobility performance at both the macro- and microlevels. VDOT uses delay as th…More

Connected Vehicle Data-Based Tools for Work Zone Active Traffic Management (Publication)

Resource Type: Books, Reports, Papers, and Research Articles

Work zones present challenges to safety and mobility that require agencies to balance limited resources with vital traffic management activities. It is important to obtain operational feedback for suc…More

Merging Vehicles and Lane Speed-Flow Relationship in a Work Zone (Publication)

Resource Type: Books, Reports, Papers, and Research Articles

In addition to closed merge lanes as physical bottlenecks of work zones, traffic oscillations caused by merging vehicles at multiple locations could reduce work zone capacity. This study took a stepwi…More

Iowa Work Zones are Getting Smarter (Publication)

Resource Type: News and Other Non-research Articles

Intelligent Transportation Systems (ITS) tools including traffic sensors and cameras are deployed in 28 state highway work zones in Iowa. Those tools sent data on traffic speed, queue length, and imag…More

Validating the Performance of the FHWA Work Zone Model Version 1.0: A Case Study Along I-91 in Springfield, Massachusetts (Publication)

Resource Type: Books, Reports, Papers, and Research Articles

Central to the effective design of work zones is being able to understand how drivers behave as they approach and enter a work zone area. States use simulation tools in modeling freeway work zones to …More

Optimization of Work Zone Segments on Urban Roads Using Cellular Automata Model in Mixed Traffic (Publication)

Resource Type: Books, Reports, Papers, and Research Articles

Increased delays and reduced speeds in work zones leads to congestion. This can be improved by optimizing the work zone length. The focus of this study is to model work zones using cellular automa…More

Feasibility of Lane Closures Using Probe Data (Publication)

Resource Type: Books, Reports, Papers, and Research Articles

To develop an adequate traffic operations management and congestion mitigation plan for every roadway maintenance and construction project requiring lane closures, transportation agencies need accurat…More

2018 National Work Zone Management Conference

September 11-13, 2018 Herndon, Virginia Program in PDF Tuesday, September 11 Wednesday, September 12 Thursday, September 13 Tuesday, September 11 8:00 am - 11:00 pm Gener… More

A Smart Highway Work Zone Merge System Enabled by Connected Vehicles (Publication)

Resource Type: Books, Reports, Papers, and Research Articles

Typical traffic control and operations at work zones usually are not very effective in mitigating the work zone bottleneck. A major reason is that the common early merge behaviors limits utilizing the…More

Safety Impacts of Queue Warning in a Connected Vehicle Environment (Publication)

Resource Type: Books, Reports, Papers, and Research Articles

Queue warning systems (QWSs) have been implemented to increase traffic safety by informing drivers about queued traffic ahead so that they can react in a timely manner to the queue. Existing QWSs rely…More

Evaluation of Variable Advisory Speed Limits in Congested Work Zones (Publication)

Resource Type: Books, Reports, Papers, and Research Articles

The effectiveness of variable “advisory” speed limit (VASL) systems in congested urban work zones was investigated. Except for one publication, all previous studies focused on regulatory speed lim…More

Effectiveness of End-of-Queue Warning Systems and Portable Rumble Strips on Lane Closure Crashes (Publication)

Resource Type: Books, Reports, Papers, and Research Articles

The Texas Department of Transportation has been deploying work zone intelligent transportation systems in an effort to reduce the number of work zone crashes along the Interstate 35 (I-35) corridor. R…More

Evaluating the Effects of Queue Warning Systems on Freeway Work Zones Using Traffic Simulation Software (Publication)

Resource Type: Books, Reports, Papers, and Research Articles

Work zones are a key component of the rehabilitation efforts that travelers on the U.S. national highway system interact with increasingly every day. Roadway construction, rehabilitation, and maintena…More

South Dakota Department of Transportation Uses New Technology in Construction Project Near Sioux Falls (Publication)

Resource Type: News and Other Non-research Articles

South Dakota Department of Transportation is using an advance queue detection system on an I-29 project to warn drivers of the construction zone. This technology is still new to South Dakota with cons…More

Work Zone Impact Assessment Methods and Applications (Publication)

Resource Type: Books, Reports, Papers, and Research Articles

Two work zone impact assessment methods were developed and their applicability was illustrated with data from recent construction projects on the I-35 Central Texas corridor. The first method was deve…More

Work Zone Traffic Management Analysis Using Analytical Methods (Training)

The course provides hands-on training on basic analytical methods (sketch planning methods) to compute work zone performance measures (WZPM). The WZPM includes the following factors: capacity, speed, … More

Dashboards for Closing the Loop on Monitoring Interstate Work Zone Maintenance of Traffic (Publication)

Resource Type: Books, Reports, Papers, and Research Articles

Although most agencies have extensive processes in place for designing interstate construction work zones, there is very little quantitative assessment performed on how those work zones operate. Opera…More

Implementation of a Real Time Data Driven Smart Work Zone Management System to Provide Queue Alerts to Stakeholders (Publication)

Resource Type: Books, Reports, Papers, and Research Articles

Queueing frequently occurs in advance of interstate work zones, and back-of-queue crashes are of concern to all agencies. Over 30,000 crashes on 2,280 directional miles of Indiana interstates in calen…More

Work Zone Impact Assessment Methods and Applications (Publication)

Resource Type: Books, Reports, Papers, and Research Articles

Two work zone impact assessment methods were developed and their applicability was illustrated using recent construction projects and actual data from the I-35 Central Texas corridor. The first method…More

Innovative End-of Queue Warning System Reduces Crashes Up to 45% (Publication)

Resource Type: Brochures and Fact Sheets

This fact sheet details the application of an innovative end-of-queue warning system developed by the Texas A&M Transportation Institute to reduce the risk of crashes on a project to widen 96 mile…More

SWZ: Technology Applications Types of Applications: Queue Warning

Queue warning systems are designed to quickly detect the presence of queues at the work zone and warning approaching motorists that traffic is slowed or stopped ahead. Application guidelines … More

Work Zone Data Collection & Analysis: What, Why, and How (Training)

This podcast is a companion to the Work Zone Safety Data Collection and Analysis Guide, which was also developed under the Work Zone Safety Grant and is available at http://www.workzonesafety.org/rese… More

Work Zone Data Collection & Analysis: What, Why, and How

Podcast: Part I - Data Collection [ Play | Download* ] Part II - Traffic Queues in Work Zones [ Play | Download* ] Part III - Speeding in Work Zones [ Play | Download* ] * To download, right-click… More

Work Zone Lane Closure Analysis Model (Publication)

Resource Type: Books, Reports, Papers, and Research Articles

At the Alabama Department of Transportation (ALDOT), the tool used by traffic engineers to predict whether a queue will form at a freeway work zone is the Excel-based "Lane Rental Model" developed at …More

Assessment of the Effect of Freeway Posted Speed Limit Reduction on Vehicular Delay at a Work Zone (Publication)

Resource Type: Books, Reports, Papers, and Research Articles

The reduction of posted speed limit at a freeway work zone plays an important role in ensuring safety of transportation system users and construction workers. However, it increases vehicular delay. Th…More

Calibration of VISSIM for Freeway Work Zones with Time-Varying Capacity (Publication)

Resource Type: Books, Reports, Papers, and Research Articles

This paper presents a systematic procedure for calibration of a VISSIM model to replicate time dependent capacity, speed, and queue length for a 2-to-1 freeway work zone. The procedure models time dep…More

Traffic Queuing

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