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Place Queue Trucks Ahead of a Work Zone to Reduce Number of Hard Braking Events and Crash Risks.

Use in-vehicle alerts to complement roadside signs. Alerts displaying the driver’s current travel speed compared to the posted speed limit may lead to a reduction in speed, increasing traffic…
Content type
Date Posted
03/25/2022

Incorporate Probe Data to Expand the Range of Smart Work Zones and Provide Measurements from Locations Beyond the Range of the Sensors.

Expand the range of work zones by using probe data to fill in detection gaps. Incorporating probe data with sensor data can provide more accurate queue warnings, reduce work zone safety costs, and…
Content type
Date Posted
12/27/2021

An Evaluation of Three Work Zone Intrusion Alarm Systems in California Provided Suggestions to Enhance Visual, Sound, and Sensor Components.

The lessons learned from the project are summarized for the WZIA systems evaluated.  Provide a visual alert and include multiple speakers and volume control to improve sound levels in all…
Content type
Date Posted
09/28/2021

Alternative Work Zone Intrusion Alarm (WZIA) Systems in California Range in Cost from $4,630 to $11,100 per Half-Mile.

A work zone intrusion alarm (WZIA) system was tested to improve the safety of the current Caltrans Standard Plans for traffic control in work zones in Sacramento, California. The objective of this…
Content type
Made Public Date
09/28/2021

Field Testing of an Automated Flagger Assistant Device in Missouri Reduces Vehicle Approach Speeds by Four Miles Per Hour and Increases Stopping Distance by 11 Feet.

Methodology: For the field study, video data that recorded driver behaviors was collected for two days in a work zone on MO 23 in Knob Noster, Missouri. Seven Measures of Effectiveness (MOEs) were…
Content type
Date Posted
08/23/2021

Avoid Using Roadway Worker Protection Warning Devices in City Centers or in Small Areas with Multiple Tracks, as Train Indications May Be More of a Nuisance than Helpful to Frontline Workers.

Technical issues with the warning device suggested a wide range of lessons learned during the project, summarized below: Understand that the use of electronic devices in active trackway could be a…
Content type
Date Posted
07/21/2021

Sacramento Regional Transit District Implements a Roadway Worker Protection System for a Total System Cost of $861,592.

Through partnership with the Federal Transit Administration (FTA), the Sacramento Regional Transit District (SacRT) conducted a demonstration test of a secondary warning device for roadway…
Content type
Made Public Date
07/21/2021

Survey on Roadway Worker Protection Warning Device in Sacramento Shows 83 Percent of Rail Transit Agency Employees Felt Safer with the Device.

  Methodology System effectiveness, including unusual occurrences or comments and system acceptance, was measured in terms of work zone intrusion rates and employee survey responses. Unusual…
Content type
Date Posted
07/21/2021