Experimental concrete pavement containing variations in joint spacing, reinforcement, dowel sections, and joint fillers were used on Minnesota T.H. 36 to determine optimum design. Surface rating, South Dakota Profile Surface Rating (PSR), and Concrete Pavement Evaluation System (COPES) studies were performed to evaluate the pavements. The best sections were the 15 foot and 20 foot sections with bituminous coated or rust inhibitor painted dowels. The longer sections, 33 foot and 65 foot, and the panels with sleeved dowels performed poorly. All joint fillers failed within three years.
This report examines the rate of accidents on rural trunk highways in Minnesota by looking at other elements of the roadside, specifically access points and signs.
A 20-year Minnesota Trunk Highway Needs Study was made by the Minnesota Highway Department in 1962 and the Comprehensive Report published in August 1963
The Critical Feature Survey was undertaken for the study of trunk highway needs and for the determination of practical road capacities.
The Critical Feature Survey was conducted on all rural 2-lane sections of the trunk highway system. The data collected relates to sight distance,
gradients, curves, and superelevations of curves. Data were not taken on the so-called institutional highways or on portions of the trunk highway system under construction.
TRS 1211, State Highway System Classification and Investment: A Survey of State Practice, contains all appendices within its report except for Appendix H which was provided as a separate multiple tab spreadsheet by Washington State DOT. It identifies distribution of funding on
the state highway system.
The spring report shows the unit prices for items in the needs calculation for the next calendar year. These include the cost of signs, the costs of various types of pavements, and the cost of maintenance of culverts and bridges.
The purpose of this Transportation Research Synthesis (TRS) is to provide an overview about the use of recycled materials in the base layers of pavements, and the design of these layers when using recycled materials. While the primary focus is on local streets and county roads, attention was also given to pavements constructed by state highway agencies.
The authors summarize the 12 responses to the survey in the topic areas of state highway system ownership, system size and density, highway standards and performance measures, funding allocation practices, operating and maintaining agency assets, and relevant documentation.
Note: TRS 1211 contains all appendices within its report except for Appendix H which was provided as a separate multiple tab spreadsheet and is available in the Supporting Item section.
To gather information about state DOT traffic forecasting practices used to project traffic volumes in nonmetropolitan areas with a population under 50,000, CTC & Associates distributed a brief online survey to members of the AASHTO Standing Committee on Planning. The survey of current practice summarizes the 30 responses to the survey. Most survey respondents use linear regression models to estimate future traffic volumes. Socioeconomic variables are widely used by survey respondents when forecasting future traffic volumes, with data on total population, employment and households most frequently cited by respondents. The most frequently cited time period used in projecting traffic volumes is 20 years.
