For more than 50 years, the Local Road Research Board (LRRB) has brought important developments to transportation engineers throughout Minnesota. Those developments range from new ways to determine pavement strength to innovative methods for engaging the public. Today, the LRRB remains true to its important mission: supporting and sharing the latest transportation research applications with the state’s city and county engineers.

Hot Topics

Pedestrian Crossing: Uncontrolled Locations

A new guidebook has been developed to help Minnesota transportation agencies evaluate their uncontrolled pedestrian crossings and determine appropriate treatment options. Funded by the Minnesota Local Road Research Board, the guidebook – Pedestrian Crossings: Uncontrolled Locations – is intended to offer agencies a consistent methodology for evaluating uncontrolled pedestrian crossing locations on their roadways. The book recommends when to install marked crosswalks and other enhancements at uncontrolled locations based on a number of factors, including average daily vehicle count, number of pedestrians, number of lanes and average vehicle speed.
Click here to read the full article.
Click here to access the guide, data collection worksheets and the full research report.
December 24, 2014

Why is All the Colored Concrete Deteriorating So Fast?

Across Minnesota, many of the estimated 45 colored concrete projects have experienced early deterioration, particularly microcracking near contraction joints. Early cracking has prompted the city of Vadnais Heights to tear up its colored concrete, and the city of Centerville —which installed colored concrete only six years ago— plans to follow suit. Both cities participated in a recent study, sponsored by the Local Road Research Board and conducted by MnDOT, to determine what is causing the early deterioration.
Click here to read the full article.
November 24, 2014

What’s With All the Potholes?

Why do roads go bad, and why aren't they fixed immediately? This LRRB video, featuring Don Shelby and local transportation officials, explains the reasons roads deteriorate and why the worst roads aren’t necessarily fixed first. See the video in the inset screen below, or click here to watch the video on You Tube.

  • May 23, 2014