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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

Use Infrared Markings and Radio Frequency Identification (RFID) Tags to Ensure Information on Roadside Machine-Readable Signs is Delivered to Vehicles.

Tighten standardizations in the Manual on Uniform Traffic Control devices (MUTCD). This should be done within and between states to make the manufacturers job easier as it would increase the…
Content type
Date Posted
03/22/2022

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

Leverage Relative Accuracy of GPS for Detecting Lane Departure and Road Direction.

Below are the lessons that can be taken from this study:  Relative accuracy of a standard GPS receiver can be leveraged for detecting lane departures. Although the error in absolute position…
Content type
Date Posted
11/24/2021

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

Increasing Warning Sign Activation Time after Last Detection Improves Animal Detection System Effectiveness for Highways.

Regardless of the deployment location, researchers recommend the following for operation and maintenance: Warning Sign Activation Time: Increase the time the warning signs are activated after the…
Content type
Date Posted
07/27/2021