OBJECTIVES To investigate the relation between local road traffic activity and the occurrence, severity, and persistence of wheeze in children. METHODS Data on wheeze and asthma were collected in a cross sectional questionnaire survey of 22,968 primary school children (age 4-11) and 27,826 secondary school children (age 11-16) in the Nottingham area. Direct measures of road traffic flow were ...

We develop an anticipative model-based predictive traffic control approach for ramp metering in freeway traffic networks. If ramp metering is implemented in a freeway network with alternative routes, traffic can spontaneously re-route due to the response of the drivers to the applied control actions. Although spontaneous re-routing can have a significant influence on the resulting traffic situa...

Traffic conditions vary over time, and therefore, traffic behavior should be modeled as a stochastic process. In this study, a probabilistic approach utilizing Autocorrelation is proposed to model the stochastic variation of traffic conditions, and subsequently, predict the traffic conditions. Using autocorrelation of the time series samples of density and flow which are collected from segments...

abstract: gridlock is an extreme traffic state where vehicle cannot move at all. this research studies the development of gridlock by theoretical and numerical analysis. it is shown that the development of gridlock can be divided into several stages. the core of the development is the evolution of congestion loop. a congestion loop is comprised of a number of consecutively connected spillover l...

The growing of the number of vehicles cause serious strains on road infrastructures. Traffic jams inevitably occur, wasting time and money for both cities and their drivers. To mitigate this problem, traffic simulation tools based on multiagent techniques can be used to quickly prototype potentially problematic scenarios to better understand their inherent causes. This work centers around the e...

This paper empirically evaluates the relative importance of embodied versus disembodied idea flows in explaining income gaps and idea gaps. Trade is used as a measure of embodied idea flows and telephone call traffic a measure of disembodied flows. Since both trade and telephone traffic may be endogenous, this paper uses the geographic, linguistic, and colonial components of trade and telephone...

based on aggregation of traffic as opposed to per flow traffic. When DiffServ is used in a real time traffic environment it is important to study the effects of traffic aggregation on quality of service parameters. Instantaneous packet delay variation (IPDV) is one of the most commonly used quality of service parameters for real time traffic. In this paper we study how IPDV of a micro flow buil...