Interest in portable bridge systems has increased in the U.S. due to heightened awareness of the need to reduce environmental impacts and costs associated with road stream crossings. However, design criteria are needed for portable bridges to insure that they are safe and cost effective. This paper discusses different portable bridge categories and their general design criteria. Specific emphas...

Compact urban development would reduce urban sprawl, leading to shorter driving distances and ultimately less regional air pollution. But it would also mean greater housing density in a given area, potentially increasing the number of residences near major roadways. Given that exposure to traffic emissions near roadways is strongly associated with asthma and related symptoms in children, a new ...

A significant portion of the observed variability in roadway performance can be due to the difference and innate heterogeneity in drivers’ behaviour. Analytical models, stated preference data collection and studies, and laboratory-based simulator experiments are developed to understand the driver behaviour for years. However, little has been done to fill the important gap between the survey/lab...

Studies investigating crash rates by roadway classification are few and far between and even more so if extended to focus on heavy vehicles. This study explores and compares two advanced econometric methods, random-parameter Tobit regression and latent class Tobit regression, to determine contributing factors for heavy vehicle crashes per million-vehicle-miles-traveled while accounting for the ...

Changing the built environment is a sound, but often underutilized approach to injury control. The authors reviewed the literature and conducted a meta-analysis to synthesize the evidence on the association of roadway characteristics with risk of pediatric pedestrian injury. To synthesize the data, they converted results to odds ratios based on direct results or abstracted outcomes and used Bay...

Improper natural ventilation practices may deteriorate indoor air quality when in close proximity to roadways, although the intention is often to reduce energy consumption. In this study, we employed a CFD-based air quality model to quantify the impact of traffic-related air pollution on the indoor air quality of a naturally ventilated building. Our study found that the building envelope restri...

This paper presents the method to estimate the traffic flow on the urban roadway by using car’s on-dashboard camera image. The system described, shows something new which utilizes only road traffic photo images to get the information about urban roadway traffic flow automatically. Keywords—traffic flow estimation; on-dashboard camera; computer vision.

This report presents STRUCTVIEW, a vehicle-based system for the measurement of roadway structure profiles, which uses a scanning laser rangefinder to measure various structure and roadway features while traveling at highway speed. Measurement capabilities include horizontal and vertical clearances which can be used to support issuing permits based on vehicle height.

Citation: Nahidi S, Fountas G, Sarvani SP, Sarwar MT and Anastasopoulos PC (2017) Project Discrepancies in Roadway Construction and Preservation: A Statistical Analysis of Public–Private Partnership Contract Types in the US. Front. Built Environ. 3:15. doi: 10.3389/fbuil.2017.00015 Project Discrepancies in roadway construction and Preservation: a statistical analysis of Public–Private Partnersh...

Road classification systems are the basis for defining function and, in turn, the design criteria for the world’s street networks. The traditional classification systems have been based on the mobility and access functions of roads for motor vehicle traffic. Other road users and road uses have been largely ignored in this important step of the road design process. This article describes alterna...