Traffic Queuing

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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

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

Improved Work Zone Design Guidelines and Enhanced Model of Travel Delays in Work Zones. Phase I: Portability and Scalability of Interarrival and Service Time Probability Distribution Functions for Different Locations in Ohio and the Establishment of Impro (Publication)

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

The project focuses on two major issues - the improvement of current work zone design practices and an analysis of vehicle interarrival time (IAT) and speed distributions for the development of a digi…More

Emissions Due to Construction Equipment and Traffic Delays – Task 6: Contribution of Vehicular Emissions Caused by Reduction in Capacity During Roadway Construction (Publication)

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

Task 6 modeled an array of possible construction work zone projects with respect to facility demand (low, medium, and high average annual daily traffic [AADT]); facility cross section (two to five lan…More

Exploring Traffic End-of-Queue in a Temporal Spatial Diagram and Applications for Work Zone Safety Analysis (Publication)

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

Vehicle queue presence and the location of the end-of-queue as a result of work zones and incidents is important for traffic management and can be acquired from inspecting each vehicle's actual trajec…More

A Review of Traffic Management and Enforcement Problems and Improvement Options at High-Volume, High-Speed Work Zones in Texas (Publication)

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

This report presents a review of possible safety problems commonly observed at work zones on high-volume, high-speed roadways in Texas. These included excessive speeds upstream and within the work zon…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

Traffic Capacity, Speed, and Queue-Discharge Rate of Indiana’s Four-Lane Freeway Work Zones (Publication)

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

In addition to traffic capacity, vehicle speeds and queue-discharge rates at work zones are essential in assessment of work zone traffic delays and user costs. The traffic flow characteristics of free…More

Modelling of Queue Length in Freeway Work Zones – Case Study Karaj-Tehran Freeway (Publication)

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

In this study, the traffic parameters were collected from three work zones in Iran in order to evaluate the queue length in the work zones. The work zones were observed at peak and non-peak hours. The…More

Evaluation of Traffic Flow Analysis Tools Applied to Work Zones Based on Flow Data Collected in the Field (Publication)

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

The Ohio Department of Transportation (ODOT) has identified the maintenance of traffic (MOT) as a top priority to serve the motoring public as part of a department strategic initiative. A key componen…More

Queuing and Natural Diversion at Short-Term Freeway Work Zone Lane Closures (Publication)

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

Research conducted to explore the effects of natural diversion on traffic conditions and travel patterns upstream of temporary work zone lane closures on high-volume urban freeways in Texas is describ…More

Advance Warning of Stopped Traffic on Freeways: Current Practices and Field Studies of Queue Propagation Speeds (Publication)

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

A major safety concern on freeways is traffic flowing at normal speed encountering unexpected slow or stopped traffic. Traffic can be queued due to recurrent congestion, work zones, or collisions and/…More

Evaluation of Construction Work Zone Operational Issues: Capacity, Queue, and Delay (Publication)

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

The Illinois Department of Transportation (IDOT) requires queuing analysis to determine traffic backups on interstate work zones. The monetary gains/losses in contractual procedures such as lane renta…More

Measuring work zone performance (Practice)

Illinois DOT is looking at measurements for work zone performance based on the following: 1. Delays caused by work zones shall not exceed more than 5 minutes per mile with a maximum of 30 minutes abov… More

Traffic Pattern Assessment and Road User Delay Costs Resulting from Roadway Construction Options (Publication)

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

This report summarizes the improved data base and analysis tools developed as part of Study 1108 for analyzing the travel impacts of freeway maintenance and reconstruction activities. The data base in…More

Traffic Flow Characteristics of the “Late Merge” Work Zone Control Strategy (Publication)

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

Conventional traffic control plans such as the one used in Nebraska ( NDOR Merge) for lane closures of rural Interstate highways normally work well as long as congestion does not develop. However, whe…More

Indiana DOT Beefing up Work Zone Safety for 2021 Construction Season (Publication)

Resource Type: News and Other Non-research Articles

The Indiana Department of Transportation (DOT) oversees the investment of more than $2 billion in 1,300 road construction projects and preventative maintenance activities in 2021. To improve work zone…More

Radial Basis Function Neural Network for Work Zone Capacity and Queue Estimation (Publication)

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

An adaptive computational model is presented for estimating the work zone capacity and queue length and delay, taking into account the following factors: number of lanes, number of open lanes, work zo…More

Queue Length Detector Reduces Risk of Rear-End Accidents in Work Zones (Publication)

Resource Type: News and Other Non-research Articles

Motorists and workers in the work zones on U.S. Route 22 in Pennsylvania will be safer thanks to the infrared intrusion alarm and the queue length detector, two work zone safety devices developed unde…More

Missouri Work Zone Capacity: Results of Field Data Analysis (Publication)

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

This report presents the results of work zone field data analyzed on interstate highways in Missouri to determine the mean breakdown and queue-discharge flow rates as measures of capacity. Several day…More

Natural Diversion at Temporary Work Zone Lane Closures on Urban Freeways in Texas (Publication)

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

The report documents the results of eleven field studies at temporary work zone lane closures on urban freeways in Texas. Study results indicated a large amount of natural diversion occurred at those …More

Assessing the Safety Impacts of Active Night Work Zones in Texas (Publication)

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

Researchers present a summary of the extent and type of nighttime work zone activity that currently occurs in Texas; an analysis of Department of Public Safety (DPS) crash data to assess the ramificat…More

Proposed Model for Predicting Motorist Delays at Two-Lane Highway Work Zones (Publication)

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

Maintenance activity on two-lane highways often requires the closure of one travel lane. Vehicles in both directions of travel are served via the one remaining lane. Under such conditions, alternating…More

Determining Queue and Congestion in Highway Work Zone Bottlenecks (Publication)

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

This study investigated some of the issues in capacity, queue length, and delay estimation in work zones. In particular, the current methods for analyzing congestion in work zones are examined. Furthe…More

Measuring work zone performance (Practice)

In the past, the state has evaluated work zones based on queue length of traffic at the work site by using ADT counts and the QUEWZ program. 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

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

A Model for Estimating Excess User Costs at Highway Work Zones (Publication)

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

Highway work zones reduce available lanes for traffic, form traffic bottlenecks, and cause traffic delays and congestion. The additional travel time and effort involved in changing driving maneuvers a…More