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Research Reports
View AllCurrent pavement design based on the AASHTO Design Guide uses an empirical approach from the results of the AASHO Road Test conducted in 1958. To address some of the limitations of the original design guide, AASHTO developed a new guide: Mechanistic Empirical Pavement Design Guide (MEPDG). This guide... Overall, nearly one-third of vehicles observed had children seated in the front seat. Significant urban/rural differences exist in child seat placement, with children in rural areas much more likely to be front-seated than children in urban areas. Differences also exist among vehicle type, with children... The use of self-consolidating concrete (SCC) for the manufacture of precast structural elements provides the benefits of increased rate of production, reduced labor needs (safety), and enhanced product quality. The same benefits apply to cast-in-place construction, especially with closely spaced reinforcing... Advancements in vehicle technology and upgrades to traffic safety laws have reduced overall traffic crash fatalities and injury severity nationwide. The same cannot be said about motorcycle fatalities which have steadily increased since 1997. This report seeks to update and expand upon a 2007 (Vachal and McGowan) report by determining changes in traffic safety policy that may have occurred in each of the Northern Rocky Mountain Region (NRMR) states (Montana, North Dakota, South Dakota, and Wyoming) between 2006 and 2010. The report will ascertain... Teen driver safety is a priority area for the NDDOT TSO in programming annual activities. In recent years, the National Safety Council Alive at 25 training has been supported as an asset in this area. The goal here was to use existing data sources to assess the efficacy of the Alive at 25 program in... In an attempt to predict these crashes, North Dakota driver licensing data and crash data were used to develop a sample of 20,392 teen drivers age 14 to 17. Within the first year after being licensed, these drivers sustained 317 crashes that resulted in an injury or death. The resulting logistic regression... North Dakota consistently experiences a relatively high level of crashes and injuries on rural roads, considering lane miles and vehicle miles traveled. Approximately 55% of the state's travel, in vehicle-miles, takes place on rural roads. North Dakota fatal crash reports from 2003 to 2007 show that... Travel behavior information is valuable to transportation policymakers, planners, and service providers. While aggregate data is helpful, segmenting a market into smaller groups allows for more targeted planning, promotion, operation, and evaluation. In this study, intercity market segments based on... Given the sparsely distributed crashes across various highway systems, this study designed an empirical Bayes (EB) based sliding window technique within a spatial context. By examining roadway safety spatially, the safety analysts are able to account for high-risk locations completely within longer predefined... |
