Institute for Transportation

…1.5 Report Organization 2. LITERATURE REVIEW 2.1 Work Zone Crash Studies 3. WORK ZONE CRASH CHARACTERISTICS OF INDIVIDUAL STATES FROM THE SWZDI REGION 3.1 Work Zone Crash Characteristics – Iowa 3.2 Work Zone Crash Characteristics – Kansas 3.3 Work Zone Crash Characteristics – Missouri 3.4 Work Zone Crash Characteristics –…

…activated before the work zone start time. Both the unverified and verified work zones had a majority of activations after the work zone start time. The unverified work zones had the most activation events within 60 minutes of the reported start time of the work zone. The verified work zones…

…non-work zone day speed-flow plots for Eastbound I-270 from McDonnell Boulevard to Route 36 (bridge work, 4,2)………………54 Figure 5.3.8. Comparison of work zone versus non-work zone day speed-flow plots for Westbound I-270 from I-170 to 367 (pavement work, 3,2) ………………………………………..55 Figure 5.3.9. Comparison of work zone versus non-work zone day…

…of the work zone conditions and reacted accordingly. For instance, drivers may have slowed before particular work zone features because they were anticipating changing conditions in the work zone rather than reacting to particular work zone features. • Work zones are complicated entities. Even with a sample of several hundred…

…work zones. (c) Establish work zone speed limits on the basis of factors specific to individual projects. Evaluation of Work Zone Speed Limits: An Objective and Subjective Analysis of Work Zones in Missouri 5 NCHRP Project 3-41 makes the following recommendations regarding work zone speed limit implementation (Migletz et al.,…

Improving the Effectiveness of Zipper Merge Lane Control in Freeway Work Zones Final Report December 2024 Sponsored by Smart Work Zone Deployment Initiative (Part of TPF-5(438)) Federal Highway Administration (Part of InTrans Project 20-733) About the Smart Work Zone Deployment Initiative The Smart Work Zone Deployment Initiative (SWZDI) is a…

…ability to distinguish work zones involving mobile work operations, such as pavement striping and pothole patching, from work zones involving stationary work. A total of 45% of respondents indicated that information distinguishing mobile from stationary work is available for none or only some of the work zones, while 27% said…

…main objective of this study is to provide a framework for developing analytical methods for estimating work zone travel time reliability, considering various factors such as traffic volume, work zone configuration, and work zone intensity. The framework covers aspects of work zone selection for the model, evaluating each work zone…

…66 or more 62 APPENDIX B WORK ZONE MAPS 63 B.1 Portage Work Zone Work Zone 64 B.2 Portage Work Zone Location Work Zone 65 B.3 Tomah Work Zone West Work Zone East Work Zone 66 B.4 Tomah Work Zone Location (West Work Zone) Work Zone 67 B.5 Tomah Work…

…more severe than non-work zone crashes; 4. Rear-end crash was the most frequent crash type in work zone crashes. Same- direction sideswipe, angle collision and head-on collision were also frequently found in work zone crashes. Truck-involved crashes were more frequent and severe in work zones; 5. Most work zone crashes…

…two-lane work zone required variables ……………………………………………………..38 Figure 7.7. Urban multi-lane highway work zone required variables …………………………………….39 Figure 7.8. Arterial work zone required variables ……………………………………………………………….39 Figure 7.9. Ramp work zone required variables ………………………………………………………………….40 Figure 7.10. Work zones on signalized intersection (4-leg) required variables ……………………….40 Figure 7.11. Work zones on unsignalized intersection…

…periods were identified using a similar screening procedure. Table 4 integrates all available information on the normal and work zone periods for each road location. 24 Table 4. Work zone and non–work zone periods of studied work zones Work Zone ID Direction Normal Analysis Period Work Zone Analysis Period Start…

…areas. Work zone objects were placed in each area according to work zone activity level. High activity areas had the following number of objects in each 500-ft segment of the 4000-ft work zone area: • 1 dynamic work zone vehicle or 1 dynamic worker • 4 static work zone vehicles…

…and Response Collection 2.3 Survey Summarization Chapter 3 Work Zone Data Collection 3.1 Work Zone Data Sources 3.2 Data Elements 3.2.1 Work Zone Location 3.2.2 Work Zone Time 3.2.3 Work Zone Lane Configuration 3.2.4 Work Zone Traffic Control 3.2.5 Other Data Elements 3.3 Work Zone Data Archiving 3.3.1 Database Type…

…Zones 24 There have been a number of attempts to develop systems which improve safety or the capacity of work zone lane mergers. Safety-related devices generally attempt to slow drivers approaching work zones through a number of strategies or protect the workers in the work zone through alarms, remote controlled…

…• Minimize number of crashes in the work zone • Minimize severity of crashes in the work zone • Minimize speed of vehicles in the work zone • Minimize speed differentials upstream of the work zone • Minimize the surprise element in the work zone • Minimize sudden braking •…

…work zone database WZED Work Zone Event Data WZDI Work Zone Data Initiative WZDS work zone data system WZDx Work Zone Data Exchange XML extensible markup language ix EXECUTIVE SUMMARY Problem Statement Accurate work zone data are a challenge that all agencies face. Agency staff that want to be proactive…

…with the safety issues of lane and pavement edge differentials as well as that related to temporary traffic control practices in work zones. The materials reviewed for general practices include research on work zone safety records, methods to warn road users of potential hazards, and driver behavior in work zones….

…zones along the highway, it will significantly improve mobility in the work zone 4.8 Three-dimensional drawings of work zones and road closures can improve work zone safety 4.7 Four-dimensional simulations of work zones and road closures can improve work zone safety 4.7 Simulation of work zones in the planning and…

…of effort required for performing work zone safety studies, because different data sources need to be cleaned and then fused together. Three types of data are required: work zone characteristics such as length, duration, location, and type; work zone traffic characteristics; and work zone crash characteristics. Thus the work zone…