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Simulation of a Coordinated Adaptive Ramp Metering Strategy Showed a Two Percent Increase in Average Weighted Speeds for Combined Ramp and Mainline Traffic.

Methodology Several sites experiencing freeway merge / diverge deficiencies and speed-change areas resulting in capacity reduction were selected for analysis of these control strategies, including:…
Content type
Date Posted
04/07/2022

Intersection Conflict Warning Systems Installed at 93 Unsignalized Rural Intersections in Multiple States Had Estimated Benefit-to-Cost Ratios Ranging from 16 to 39.

METHODOLOGY In order to account for potential selection bias and regression-to-the-mean, an empirical Bayes before–after analysis was conducted, using reference groups of similar four-legged, rural…
Content type
Date Posted
11/24/2021

Intersection Conflict Warning Systems Should Avoid Using Messages Such as “Traffic Approaching When Flashing” Since the Signs May Not Always Flash.

Based on the installation details of ICWS provided by Minnesota, Missouri, and North Carolina, the following lessons are summarized: Expect operational challenges. Especially for prototype systems,…
Content type
Date Posted
11/24/2021

Open communication and transparency: Recommendations to avoid sticker shock from the Minnesota DOT.