Marti, Michael M.

This summary report is an illustrated description of a surface condition rating procedure for flexible pavements. A slide tape presentation has also been prepared on this subject. This report and the slide tape can be used together to supplement each other and the report can be used as a reference during field condition surveys. Both documents are intended to be training aids for people who are responsible for evaluating pavement conditions and selecting appropriate maintenance procedure

This report is the third and final of a series prepared for the Minnesota Local Road Research Board (LRRB) that contains summaries of highway research projects which have been conducted in Minnesota for the last 25 years. These summaries will be valuable references to city and county Engineers and others who are responsible for the construction and management of roads, streets, highways, and other related facilities. Volume III summarizes over 115 research projects which have been sponsored by the State of Minnesota Department of Transportation (earlier Department of Highways) since 1960. These research projects were all state funded by the Minnesota Department of Transportation (Mn/DOT). These projects cover a wide variety of subjects including surface treatment, pavement design and evaluation, materials evaluation, and roadside turf establishment to name a few. Much of the Information resulting from these projects is of value to all city and county engineers, as well as Mn/DOT engineers and the Industry.

This report is the second of a series prepared for the Minnesota Local Road Research Board (LRRB) that contains summaries of highway research projects which have been conducted in Minnesota for the last 25 years. These summaries will be valuable references to city and county Engineers and others who are responsible for the construction and management of roads/ streets/ highways, and other related facilities. Volume II summarizes over 35 research projects which have been sponsored by the State of Minnesota Department of Transportation (earlier Dept. of Highways) since 1960. Some projects received funding assistance through the Federal Highway Administration (FHWA) previously Bureau of Public Roads. These projects cover a wide variety of subjects including surface treatment, pavement design and evaluation, materials evaluation, and roadside turf establishment to name a few. Much of the information resulting from these projects is of value to all city and county engineers; as well as Mn/DOT engineers and the industry.

This is the appendix for Report 86-07/ Investigation No. 666 "Thickness Design of Low-Volume Bituminous-Surfaced Roads."

Investigation 666 has been conducted to study the design thickness and material requirements for roads in Minnesota with traffic less than 1,000 ADT on the county and city systems. A previous study had been conducted (Investigation 655) to review the methods used by local agencies in Canada and the northern states of the U.S.A. Six of the methods were compared by designing for six specific locations with two levels of traffic each. The designs were from least to most conservative at the different conditions. The Minnesota R-Value and AASHTO Interim Guide procedures were judged to be most appropriate for Minnesota cities and counties. Three traffic counter-classifier devices were evaluated for monitoring of traffic. The Streeter-Amet TrafiComp with a computerized (Model 140 Reader) could be used by the cities and counties for traffic monitoring. A test plan has been devised to document the performance of low-volume roads in Minnesota based on the design parameters used in the Minnesota R-Value and AASHTO procedures. The parameters are pavement materials, embankment soil strength, in-place granular equivalent thickness, and traffic. These four, five, three and three levels respectively have been selected to establish cells for a factorial design study Sixty-five field sections have been established throughout the state. They have been located and documented with the assistance of the respective county engineers. The sections selected have previously been tested with the Road Rater or Benkelman Beam and the traffic analyzed. The thickness has only been checked with the office records. The present field condition has been observed. This information should continue to be obtained to verify the performance relationships used for the AASHTO Interim Guide and the Minnesota R-Value Design Procedure. Additional test sections need to be added to fill out the factorial plan.

The MnDOT Bridge Office sought out information on best practices regarding the use of drainage systems on bridges. Minnesota regulations strongly discourage the discharge of runoff directly into waterways; however, bridge drainage systems can lead to accelerated deterioration in bridge elements. MnDOT requested a synthesis to gather information to assist them in future development of guidance on design, detailing, specifications, construction, and maintenance procedures for bridge needs, focusing specifically on agencies with similar northern climates to the greatest extent possible.

This manual describes the evaluation and design procedures for pavement rehabilitation. The evaluation emphasizes a number of variables or conditions that should be considered. This manual does not introduce any new technology. Thickness designs of new pavements require two primary variable: traffic and soil strength. Rehabilitation design requires several additional variables such as: pavement structure, condition and strength. Rehabilitation design can involve more alternatives than new design that deal with materials, equipment, disruption of traffic and work zone safety. This manual has been written as a working reference to help identify and classify the surface distress, explore the various rehabilitation alternatives, select an appropriate alternative and briefly describe the rehabilitation procedure. The manual provides standardized identification of distress types for both flexible and rigid pavements, calculation procedures for Equivalent Axle Loads, and a brief synopsis of the AASHTO thickness design procedure. This manual should be used by cities and counties as a reference in developing rehabilitation strategies

This report summarizes 16 years of projects and products of the Minnesota Local Road Research Board's (LRRB) Research Implementation Committee. The report includes a general overview of the LRRB's Research Implementation Committee (RIC) and also provides a summary of implementation products and projects that the RIC sponsored from the years 1980 to 1996. The report divides implementation products into three areas: research syntheses, Research Implementation Series (RIS), and videotapes. It also presents the following information on implementation projects: title, author, date summary, project number, and a description of implementation or current status.

This form letter was created as part of Report 2010RIC02, "Sign Retroreflectivity - A Minnesota Toolkit." It was created to be sent by other agencies as a follow-up to the County letter, to stress the importance of addressing FHWA requirements.

This form letter was created as part of Report 2010RIC02, "Sign Retroreflectivity - A Minnesota Toolkit." It is meant to be sent by County Engineers to small local agencies within their county, to notify them of requirements and resources.