Bluetooth data Anonymous Wireless Address Matching stations monitored travel

Bluetooth data anonymous wireless address matching

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Bluetooth data Anonymous Wireless Address Matching stations monitored travel time Findings Maximum queue length exceeded 3.5 miles during an incident Speeds reduced by 40 mph during an incident Traffic recovery took 3.5 hours following an incident Bluetooth showed that lane closures did not significantly decrease speeds The effectiveness of portable changeable message signs with graphics was evaluated by Huang and Bai (2013). Graphics are quicker to interpret by drivers and cause a greater reduced mean speed. The chosen locations in Kansas were rural, two-lane highways. These sites were ideal because a flagger, or, in this case, an image of a flagger, was necessary. Graphics of flaggers and construction workers were compared to messages with only text and a combination of graphics and text. Text-Graphics were then compared to two alternative graphics. Graphics reduced mean speeds between 13-17%.
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42 Table A21. Huang and Bai (2013) Summary Characteristics Phase 1, K-13 in Kansas, 65mph Phase 2, US-75 between Burlington, KS and I-35, 65mph 5 JAMAR TRAX Apollyon speed sensors and portable changeable message signs Rural, two lane needed for image of flagger to be evaluated Performance Measures Speeds Speed reduction measured using speed sensors Intended Benefits Improve changeable message sign displays Methodology Speed Data Gap time between sensors were recorded Findings Phase 1 8 mph reduction, Text only = 13% 6 mph reduction, Text and Graphic = 10% 11 mph reduction, Graphic only = 17% Phase 2 8 mph reduction, Text-Graphic 1 = 13% 8 mph reduction, Text-Graphic 2 = 13% 7 mph reduction, Text-Graphic original = 11% Graphics are significantly more effective than using only text on portable changeable message signs McCanna (2013) presented on work zone ITS at the Transportation Research Board conference. From 2005-2011, the State of Oregon replaced 365 bridges which significantly decreased highway mobility. Oregon followed the example of other State’s Department of Transportation by applying ITS in work zones starting in 2010. ODOT developed a Qualified Products List allowing them to consistently compare vendor’s equipment. Oregon will evaluate their fourth vendor starting in summer of 2013. Recommendations include increasing law enforcement at construction zones in an overtime program and replacing out-dated signs as soon as possible.
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43 Table A22. McCanna (2013) Summary Characteristics 3 ITS vendor demonstrations in State of Oregon 4 th vendor demo to be on I-84 at US 97 interchange Portable Changeable Message Signs, traffic sensors, static signs and markings, reduced speed zones, screens to minimize gawking, pan-tilt- zoom cameras, and the Work Zone Traffic Analysis (WZTA) computer program Performance Measures Diversion, Delays, Queues, Accident rates, and Speeds Drivers warned of downstream conditions using message signs Overall reduction in delay Intended Benefits Improve traffic safety Optimize traffic management Methodology Data collected on construction sites System communicated traffic conditions to DOT personnel Findings Traffic communications need to be specific about either traffic
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