Strategies for Work Zone Transportation Management Plans (2020) / Chapter Skim
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Pages 68-99
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From page 68... ...
68 Traffic Incident Management and Enforcement Strategies This section includes various strategies to manage work zone traffic operations strategies to provide adequate enforcement of traffic regulations in work zones. The following sections are covered: • Queue warning systems • Work zone incident management plans • Temporary incident-detection and surveillance systems • Freeway service patrols • Traffic screens (a.k.a.
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Traffic Incident Management and Enforcement Strategies 69 Figure 4.1. Queue warning system layout (Credit: MnDOT)
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70 Strategies for Work Zone Transportation Management Plans • Estimated queues initiated on crossroads could cause traffic conflicts or delays on the main-line road, such as backups beyond the length of ramps, through or around turns in intersections, or other hazardous congestion situations. • The project and queue area has a history of crashes.
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Traffic Incident Management and Enforcement Strategies 71 4.1.5 Crash Modification Factor Table 4.1 shows the CMF for a work zone QWS. Chapter 13 provides more information on developing WZCMFs.
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72 Strategies for Work Zone Transportation Management Plans Several IDOT districts have on-call contracts to deploy QWS for shorter-duration work zones, lasting less than 2 weeks, that may have queues but do not have a project budget large enough to support the SWZ deployment. MDOT notes the importance of calling out specific pay items (e.g., PCMS, sensors, cameras)
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Traffic Incident Management and Enforcement Strategies 73 • Automatically set the PCMS message sequences to reflect the current traffic-flow status to the nearest minute, update every 60 seconds, or update to a customized frequency defined by the engineer. • Have default queue level thresholds (normal, slowing, stopped)
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74 Strategies for Work Zone Transportation Management Plans Cost estimates for a QWS deployed by WisDOT in 2016 on two separate bridge construction projects were as follows: • 6 PCMSs, 14 sensors for $826 per day (total for 77 days = $63,602)
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Traffic Incident Management and Enforcement Strategies 75 Queue Warning Systems in Work Zones: Summary of Uses and Benefits, ENTERPRISE Transportation Pooled Fund Study TPF-5 (231)
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76 Strategies for Work Zone Transportation Management Plans Figure 4.4 illustrates the timeline of a typical incident that might be a crash affecting one or more travel lanes. The steps shown represent the typical sequence for most moderate-to-serious incidents.
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Traffic Incident Management and Enforcement Strategies 77 Regular training and follow-up sessions are necessary to ensure all agencies and construction personnel are familiar with plan procedures. 4.2.7 Design Features and Requirements Agencies need to ensure that developing an IMP is a collaborative effort with the project owner and emergency response agencies; the IMP either can be a stand-alone document or incorporated into the TMP.
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78 Strategies for Work Zone Transportation Management Plans Bremer, W., D
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Traffic Incident Management and Enforcement Strategies 79 • Provides details about each disabled vehicle or crash site (e.g., size of vehicle, orientation of vehicle, fuel or cargo spills) so the appropriate response vehicles and equipment can be deployed effectively.
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80 Strategies for Work Zone Transportation Management Plans 4.3.6 Implementation Considerations The following aspects should be considered for deployment of temporary incident-detection and surveillance systems: • Agencies need a reliable means of communication to transmit data, as geography or infrastructure may limit communication options. • A TMC needs to be in place or established.
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Traffic Incident Management and Enforcement Strategies 81 4.3.8.2 Work Zone Accident Reduction Deployment System MnDOT led the launch of the Work Zone Accident Reduction Deployment (WZARD) system in January 2012 along eastbound I-94 between TH 15 in Saint Cloud to TH 101 in Rogers, totaling 34 mi.
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82 Strategies for Work Zone Transportation Management Plans • Travelers along I-94 outside of the metro area received crucial traveler information, including advance warning of work zone activities and traffic incidents. • Planned and currently installed roadside technologies were integrated with automated systems to streamline traveler information and reduce MnDOT and Minnesota State Patrol vehicle crashes or conflicts on the corridor.
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Traffic Incident Management and Enforcement Strategies 83 4.4.2 When to Use Tow/freeway service patrols are best suited for use in the following situations: • Long project duration. • High public exposure and traffic volume.
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84 Strategies for Work Zone Transportation Management Plans programs involve close relationships between law enforcement and FSP personnel, who trust and depend on each other. When implementing contracts for towing services, a DOT needs to consider the level of service required of the contractor and the ensuing liability involved.
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Traffic Incident Management and Enforcement Strategies 85 • Assisting stranded motorists with cell phone service or providing a safe place they can wait if their vehicle is disabled. • Arranging for towing by calling on behalf of the motorist.
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86 Strategies for Work Zone Transportation Management Plans E-mail requests to the FST program manager for work zone FST are to be made by December 15 of the year before construction. All FST contracts are bid together in a statewide request for bids.
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Traffic Incident Management and Enforcement Strategies 87 4.5 Traffic Screens (a.k.a. Glare Screens, a.k.a.
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88 Strategies for Work Zone Transportation Management Plans 3. Three or more of the following characteristics are met: – Median widths less than 20 ft.
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Traffic Incident Management and Enforcement Strategies 89 4.5.8 State of the Practice In March 2018, WisDOT piloted the use of gawk screens along a ½-mi stretch of the I-41 work zone in Winnebago County (Figure 4.8)
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90 Strategies for Work Zone Transportation Management Plans speed. The agency or entity authorized to issue speeding citations then reviews the images and mails a citation to the vehicle's registered owner.
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Traffic Incident Management and Enforcement Strategies 91 or red-light enforcement can provide a basis for a legislative request to allow ASE in work zones. Information on existing legislation permitting, limiting, or prohibiting the use of speed or red-light cameras at the state or local level can be found on the GHSA webpage.10 Agencies typically involved include the state DOT, state police or local police, the state department of motor vehicles, and courts.
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92 Strategies for Work Zone Transportation Management Plans • Speed-detection equipment includes radar, laser, or other proven technology that has International Association of Chiefs of Police approval for speed measurement. Approved speed-detection equipment needs to have an ongoing maintenance record to ensure it is calibrated and functioning properly.
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Traffic Incident Management and Enforcement Strategies 93 viable. Drivers can find out which work zones are using ASE by going online to the Maryland SafeZones website (http://www.safezones.maryland.gov)
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94 Strategies for Work Zone Transportation Management Plans 4.6.8.3 Illinois In 2006, Illinois was the first U.S. state to implement ASE in work zones.
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Traffic Incident Management and Enforcement Strategies 95 the vehicle, which must be displayed within 150 ft of the photo radar unit. A uniformed police officer in a marked vehicle must be present for a citation to be issued.
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96 Strategies for Work Zone Transportation Management Plans 4.7 Police Enforcement 4.7.1 Description Police enforcement involves police patrols in the work zone under a contractual arrangement with the agency or contractor. Law enforcement activities can be in the form of stationary patrol vehicles, a police traffic controller (an officer does the flagging)
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Traffic Incident Management and Enforcement Strategies 97 • Speed reduction of 3.6 mph for automobiles and 2.7 mph for trucks (Chen and Tarko 2013)
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From page 98... ...
98 Strategies for Work Zone Transportation Management Plans 4.7.8 State of the Practice Most states have policies regarding the use of uniformed off-duty police officers in highway construction work zones. Most frequently, the state DOT funds the program for the law enforcement agency.
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From page 99... ...
Traffic Incident Management and Enforcement Strategies 99 Srinivasan, S Analyzing Effectiveness of Enhanced Penalty Zones and Police Enforcement as Freeway Speed-Control Measures, Southeast Transportation Center, University of Tennessee, Knoxville, 2011.
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