01049596

Component

https://doi.org/10.3141/2015-02

http://scholar.google.com...neau&publication_year=2007

A practical methodology to reduce traffic conflicts at work zones was developed and evaluated in the field. The proposed system uses variable advisory speed limits that are determined with a two-stage speed reduction scheme. The system is designed to lower the speed of the upstream traffic approaching the work zone bottleneck to the same level as the downstream flow. The system was implemented at one of the I-494 work zones in the Twin Cities, Minnesota, for a 3-week period in 2006. Data collected from the field indicated a 25% to 35% reduction of the average 1-min maximum speed difference along the work zone area during the 6:00 to 8:00 a.m. morning peak periods after the system was implemented. The reduction in speed difference also resulted in an approximate 7% increase of the total throughput volume measured at the downstream work zone boundary during the 6:00 to 7:00 a.m. periods. The volume increase during the 7:00 to 8:00 a.m. periods was not significant. Estimation of the driver compliance rate, by comparing the speed differences upstream and downstream of the advisory speed limit signs, showed 20% to 60% correlation levels during the morning peak periods.

01084471

English

pp 12-18

2007

Transportation Research Record: Journal of the Transportation Research Board

9780309104418

Print

Figures (12) ; Photos (1) ; References (8)

Bottlenecks; Compliance; Morning; Peak hour traffic; Speed limits; Traffic conflicts; Traffic flow; Variable speed limits; Work zone traffic control; Work zones

Advisory speed limit signs; Downstream traffic; Traffic throughput; Upstream traffic

Twin Cities Metropolitan Area (Minnesota)

Highways; Maintenance and Preservation; Operations and Traffic Management; I60: Maintenance; I73: Traffic Control

TRIS, TRB, ATRI

Feb 8 2007 7:15PM

• Characterization and Mitigation of Temperature Sensitivity Within Mobile Retroreflectometer Unit
• Development and Evaluation of Speed-Activated Sign to Reduce Speeds in Work Zones
• Driver Understanding of Sequential Portable Changeable Message Signs in Work Zones
• Driving Simulator Validation for Nighttime Construction Work Zone Devices
• Enhancing Road Weather Information Through Vehicle Infrastructure Integration
• Evaluating the Retroreflectivity of Pavement Marking Materials Under Continuous Wetting Conditions
• Evaluation of Alternative Dates for Advance Notification on Portable Changeable Message Signs in Work Zones
• Finite Element Modeling of Stresses Inside a Raised Pavement Marker During Tire–Marker Impacts
• Online Estimation of Friction Coefficients of Winter Road Surfaces Using the Unscented Kalman Filter
• Revisiting the Use of Drone Radar to Reduce Speed in Work Zones: South Carolina's Experience
• Study on Improving Worker Safety at Roadway Sites in Japan
• Urban Freeway Crash Analysis: Geometric, Operational, and Weather Effects on Crash Number and Severity
• Wet Night Visibility of Pavement Markings: Dynamic Experiment
• Work Zone Crashes Involving Traffic Control Devices, Safety Features, and Work Vehicles and Equipment