This paper concerns with aggregate calibration of urban travel demand model parameters from traffic counts. A bilevel sequential Non-linear Generalised Least Square Estimator (NGLS) has been proposed to calibrate a travel demand model. The first aim was to find out the effects of the required input data accuracy assumptions on the model calibration. The second aim was to show the possibility to...

rapid urban growth is resulting into increase in travel demand and private vehicle ownership in urban areas. in the present scenario the existing infrastructure has failed to match the demand that leads to traffic congestion, vehicular pollution and accidents. with traffic congestion augmentation on the road, delay of commuters has increased and reliability of road network has decreased. four s...

This article explores the development of previous models to determine hubs in a competitive environment. In this paper, by comparing parameters of the ticket price, travel time and the service quality of hub airports, airline hubs are divided into six categories. The degree of importance of travel time and travel cost are determined by a multivariate Lagrange interpolation method, which can pla...

Throughout the world, there are many threats to existing coral reefs. Global warming (1), mining (2), overfishing (3), and water pollution (4) all threaten the viability and health of coral reefs. Although these threats are well documented, programs to protect coral reefs are spotty and underfunded. Advocates for coral reef protection argue that there are many benefits to maintaining coral reef...

Modeling the interaction between the built environment and travel behavior is of much interest to transportation planning professionals due to the desire to curb vehicular travel demand through modifications to built environment attributes. However, such models need to take into account self-selection effects in residential location choice, wherein households choose to reside in neighborhoods a...

This paper addresses the problem of real-time estimation of urban arterial network performance. A number of analytical time-dependent models have been formulated and implemented for the on-line estimation of arterial link and system travel times. The proposed models provide alternative ways of incorporating the contribution of various network and operational characteristics to the travel time. ...