Table A24 King et al 2004 Summary Characteristics I 70 in Wentzville Missouri

Table a24 king et al 2004 summary characteristics i

This preview shows page 60 - 62 out of 71 pages.

Table A24. King et al. (2004) Summary Characteristics I-70 in Wentzville, Missouri IntelliZone 2 variable message signs (VMS), 6 magnetic and video detectors, and a mobile command unit Survey of 101 drivers; 62 face-to-face and 39 returned by mail Performance Measures Speeds Mean speed and speed variance were the performance measures Mean headway and vehicle conflict data were collected but not analyzed Intended Benefits Improve safety on freeway work zones Methodology Speed, volume, and headway data collected by detectors and sent wirelessly to command unit Due to sight restrictions of the video cameras, conflict data was limited Data collected before and after system deployment Findings From survey, 63% slowed down and 3.6% diverted due to VMS On average, speeds reduced by 7 mph The Federal Highway Administration (2002) preformed a study on ITS in work zones to provide an overall guide for smart work zones in four case studies and the lessons learned from those experiences. ITS is normally used for managing traffic which involves providing real-time messages to the public, improving accident response time, tracking behavior changes, and even enforcement of traffic law. The main operations of the studies were to detect traffic congestion and send messages to the public via dynamic message signs along the road, the radio, and/or the internet. From the four case studies, the lessons learned were to test ITS equipment for reliability
Image of page 60
45 in processing data and sending out appropriate messages, increase awareness of the public about the work zone traffic plan, allow portability of equipment if the work zone consistently moves, allow associated staff to have discretion on what information is displayed because an automated system could malfunction, and provide ease of access to equipment because of a need for a reset, realignment, or manual override. Table A25. Federal Highway Administration (2002) Summary Characteristics I-55 Springfield, Illinois Automated Portable Real-Time Traffic Control System (RTTCS) 17 DMS, 8 sensors, 4 closed circuit television (CCTV) cameras, Internet website Performance Measures Queue and Speeds Queue lengths begin alert system Intended Benefits Manage and monitor traffic Provide travel information Methodology Data collected wirelessly, data processed by traffic station Volume and speed calculated Advisory messages displayed on DMS and website Findings No significant queues Communicate well between engineers, construction personnel, and emergency response Characteristics I-496 Lansing, Michigan Fully closed highway sections, all traffic was diverted Temporary Traffic Management System (TTMS) 17 cameras, 12 DMSs, six queue detectors, and National Sign and Signal's ‘ITSworkzone’ software, Internet website, Mana gement Staff Performance Measures Queue and Speeds Advanced warning of queue can reduce back of queue crashes Intended Benefits Manage and monitor traffic Provide travel information Methodology Data collected wirelessly, data processed by software at Construction Traffic Management Center (CTMC)
Image of page 61
Image of page 62

You've reached the end of your free preview.

Want to read all 71 pages?

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Stuck? We have tutors online 24/7 who can help you get unstuck.
A+ icon
Ask Expert Tutors You can ask You can ask You can ask (will expire )
Answers in as fast as 15 minutes
A+ icon
Ask Expert Tutors