Uniform system of accounts for carriers by inland and coastal waterways.

Mode of access: Internet.

Investment of steam railways in highway motor vehicle enterprises as of May 1, 1936. Summary of returns on Statistical series circular no. 22.

Published by the Bureau under its earlier name: Bureau of Statistics.

An Illinois pavement feedback system : feasibility and system requirements /

"Project IHR-517, Illinois Cooperative Highway Research Program."

Federal aid primary route 340 interstate route 55 to interstate route 80 Cook, DuPage, and Will Counties : final environmental impact statement and section 4(f) evaluation : submitted pursuant to 42 U.S.C. 4332(2)(c) and 49 U.S.C. 303 /

"FHWA-IL-EIS-93-03-D/4(F)"

FAP 340 (I-355 South Extension) Interstate Route 55 to Interstate Route 80, Cook, DuPage and Will Counties : draft supplemental final environmental impact statement and section 4 (f) evaluation /

"FHWA-IL-EIS-93-03-FS/4(f)."

Operational software modifications to the moving merge control system in Tampa, Florida /

Mode of access: Internet.

Analysis of N-layered viscoelastic pavement system /

Mode of access: Internet.

CANDE system manual /

Mode of access: Internet.

Integrated motorist information system (IMIS) feasibility and design study : phase 1 : feasibility /

Mode of access: Internet.

Motorist aid citizens radio service as a wide area communication system /

Mode of access: Internet.

National automotive sampling system : crashworthiness data system, 1992-1994.

"DOT HS 808 538"--P. [4] of cover.

Development and testing of an airbag and energy absorbing lap belt combination restraint system: final report.

"Contract no. FH-11-6962."

Tyre-force estimation by Kalman inverse filtering: applications to off-highway mining trucks

Kalman inverse filtering is used to develop a methodology for real-time estimation of forces acting at the interface between tyre and road on large off-highway mining trucks. The system model formulated is capable of estimating the three components of tyre-force at each wheel of the truck using a practical set of measurements and inputs. Good tracking is obtained by the estimated tyre-forces when compared with those simulated by an ADAMS virtual-truck model. A sensitivity analysis determines the susceptibility of the tyre-force estimates to uncertainties in the truck's parameters.

Estimation of average annual daily traffic (AADT) using geographically weighted regression (GWR) method and geographic information system (GIS)

Annual average daily traffic (AADT) is important information for many transportation planning, design, operation, and maintenance activities, as well as for the allocation of highway funds. Many studies have attempted AADT estimation using factor approach, regression analysis, time series, and artificial neural networks. However, these methods are unable to account for spatially variable influence of independent variables on the dependent variable even though it is well known that to many transportation problems, including AADT estimation, spatial context is important. ^ In this study, applications of geographically weighted regression (GWR) methods to estimating AADT were investigated. The GWR based methods considered the influence of correlations among the variables over space and the spatially non-stationarity of the variables. A GWR model allows different relationships between the dependent and independent variables to exist at different points in space. In other words, model parameters vary from location to location and the locally linear regression parameters at a point are affected more by observations near that point than observations further away. ^ The study area was Broward County, Florida. Broward County lies on the Atlantic coast between Palm Beach and Miami-Dade counties. In this study, a total of 67 variables were considered as potential AADT predictors, and six variables (lanes, speed, regional accessibility, direct access, density of roadway length, and density of seasonal household) were selected to develop the models. ^ To investigate the predictive powers of various AADT predictors over the space, the statistics including local r-square, local parameter estimates, and local errors were examined and mapped. The local variations in relationships among parameters were investigated, measured, and mapped to assess the usefulness of GWR methods. ^ The results indicated that the GWR models were able to better explain the variation in the data and to predict AADT with smaller errors than the ordinary linear regression models for the same dataset. Additionally, GWR was able to model the spatial non-stationarity in the data, i.e., the spatially varying relationship between AADT and predictors, which cannot be modeled in ordinary linear regression. ^

Research-to-Practice (R2P) Tools for Improving Safety in Nighttime Highway Construction Work Zones

The safety of workers in nighttime roadway work zones has become a major concern for state transportation agencies due to the increase in the number of work zone fatalities. During the last decade, several studies have focused on the improvement of safety in nighttime roadway work zones; but the element that is still missing is a set of tools for translating the research results into practice. This paper discusses: 1) the importance of translating the research results related to the safety of workers and safety planning of nighttime work zones into practice, and 2) examples of tools that can be used for translating the results of such studies into practice. A tool that can propose safety recommendations in nighttime work zones and a web-based safety training tool for workers are presented in this paper. The tools were created as a component of a five-year research study on the assessment of the safety of nighttime roadway construction. The objectives of both tools are explained as well as their functionalities (i.e., what the tools can do for the users); their components (e.g., knowledge base, database, and interfaces); and their structures (i.e., how the components of the tools are organized to meet the objectives). Evaluations by the proposed users of each tool are also presented.