The National Academies Press

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From page 5... ... 5 Work Zone Intrusion Technologies The chapter describes representative technologies that provide the following functionalities to prevent and mitigate the impact of intrusions in work zones: positive protection devices, worker warning systems, and driver warning systems. Each technology in the three categories is discussed in terms of the following aspects: description of the technology, current and potential WZIT applications, effectiveness of the technology, and implementation guidelines. Read the entire page →
From page 6... ... 6 Guide to Alternative Technologies for Preventing and Mitigating Vehicle Intrusions into Highway Work Zones Effectiveness The ATMA truck follows the trajectory of a lead vehicle. This concept takes the advantage of linked and automated vehicle technology. Read the entire page →
From page 7... ... Work Zone Intrusion Technologies 7 truck (Mobile Barriers n.d.) Read the entire page →
From page 8... ... 8 Guide to Alternative Technologies for Preventing and Mitigating Vehicle Intrusions into Highway Work Zones taper in advance of the designated work area along the appropriate longitudinal line with the barrier. The mobile barrier may replace the advanced warning vehicle when the work area is on the shoulder or the shadow vehicle when the work area is in the travel way. Read the entire page →
From page 9... ... Work Zone Intrusion Technologies 9 recognize the potential benefits of AFADs and impose and expand the device standards and guidelines more than what is set by the MUTCD. In some cases, additional countermeasures are added in, such as warning lights, backup battery power, and flashing lights or gate arms on the slow/stop signs. Read the entire page →
From page 10... ... 10 Guide to Alternative Technologies for Preventing and Mitigating Vehicle Intrusions into Highway Work Zones An illustrative example of such a system is a radar-based system that can identify a potential work zone intrusion from several vehicles while also warning the errant driver and jobsite personnel who may be in danger. This is called the AWARE system (https://theasphaltpro.com/ articles/oldcastle-aware-system/) Read the entire page →
From page 11... ... Work Zone Intrusion Technologies 11 3.2.2 Intrusion Alert Systems with Cone/Barrel-Mounted Sensors Technology Description Intrusion alert systems with cone/barrel-mounted sensors use sensors embedded in the devices and generally are impact-activated work zone intrusion devices. The intrusion devices are mounted on a cone/barrel and generally are activated when a vehicle hits the cone/barrel during the intrusion impact. Read the entire page →
From page 12... ... 12 Guide to Alternative Technologies for Preventing and Mitigating Vehicle Intrusions into Highway Work Zones setup look of the SonoBlaster. The SonoBlaster is activated when there is impact-tilt contact by a vehicle and the device emits an audible alarm sound in the work zone at an audio level of 125 decibels for 15 seconds. Read the entire page →
From page 13... ... Work Zone Intrusion Technologies 13 due to the possibility of sideswiping by vehicles that knock over cones and barrels without resulting in intrusions. Implementation Guidelines In addition to guidelines provided for the other cone or barrel-mounted systems, line of sight to ensure radio communication must be considered for this type of device. Read the entire page →
From page 14... ... 14 Guide to Alternative Technologies for Preventing and Mitigating Vehicle Intrusions into Highway Work Zones Current and Potential WZIT Applications WAS is activated when a vehicle passes over the trip tube. The pressure sensor sends a signal wirelessly to the portable alarm case (PAC) Read the entire page →
From page 15... ... Work Zone Intrusion Technologies 15 the Bluetooth zones. This application not only extends to detect close proximity sensing, but the automated collection of information enables sharing e-notices to drivers and diverting traffic flow (Park et al. Read the entire page →
From page 16... ... 16 Guide to Alternative Technologies for Preventing and Mitigating Vehicle Intrusions into Highway Work Zones 3.2.7 Smartwatches/Bracelets Technology Description Smartwatches are electronic watches with the capability to connect to a wireless system through Bluetooth and Wi-Fi systems and enable the user to read messages and get alerts or warnings through flashing lights or vibration. An application of the smartwatch integrated with a network of Bluetooth zones was seen in a long-term work zone configuration. Read the entire page →
From page 17... ... Work Zone Intrusion Technologies 17 than using a text DMS from 1,475 ft to 1,000 ft upstream of a work zone; and (3) using a graphic DMS reduced mean vehicle speed more effectively than using a text portable changeable message sign (PCMS) Read the entire page →
From page 18... ... 18 Guide to Alternative Technologies for Preventing and Mitigating Vehicle Intrusions into Highway Work Zones vehicle drivers at the upstream location of the construction zone. Another feature is that it alerts vehicle drivers to slow down owing to traffic ahead or to take a detour to save time before reaching the starting location of the traffic queue. Read the entire page →
From page 19... ... Work Zone Intrusion Technologies 19 Implementation Guidelines Special training and permits are required for the operator with adequate contingencies put in place to handle the power requirements of drones and their operations near highways. 3.3.4 Connected and Autonomous Vehicles (CAVs) Read the entire page →
From page 20... ... 20 Guide to Alternative Technologies for Preventing and Mitigating Vehicle Intrusions into Highway Work Zones augmented by a strobe light wrapped around the hardhat and powered by a battery strapped to the worker. The lights flash around to indicate to the driver of the vehicle of the presence of the worker in the night. Read the entire page →

From page 5...

... 5 Work Zone Intrusion Technologies The chapter describes representative technologies that provide the following functionalities to prevent and mitigate the impact of intrusions in work zones: positive protection devices, worker warning systems, and driver warning systems. Each technology in the three categories is discussed in terms of the following aspects: description of the technology, current and potential WZIT applications, effectiveness of the technology, and implementation guidelines.