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Tan C.,Land Transport Authority of Singapore
17th ITS World Congress | Year: 2010

With a rapidly ageing population, Singapore will witness a threefold increase in the number of residents aged 65 years or older, i.e. from 300,000 now to 900,000 in 2030. By then, one out of every five residents will be a senior resident. With lower mobility, the elderly are a vulnerable group of users on the roads. Singapore recognises this fact and is constantly making its transportation infrastructures more elderly friendly to allow senior residents to live independently and to continue to engage actively in the society. Such an enabling environment must provide senior residents with safe unhindered access from homes to public amenities, communal and recreational facilities. On the other hand, there is a need to ensure that the needs of other road users, such as motorists, are not adversely affected when meeting the needs of the elderly. In this Green Man Plus project, the Land Transport Authority (LTA) uses technology to help the elderly cross the road more comfortably without adversely affecting the traffic flow. This paper presents the overview and experience of the implementation of the Green Man Plus system. Source

Sindhwani M.,235 Innovation Center Blk 2 | Xin Q.K.,Land Transport Authority of Singapore
17th ITS World Congress | Year: 2010

The Singapore Traffic Information Platform (TRIP) was developed in 2008 under a technical collaboration between the Land Transport Authority of Singapore (LTA) and Quantum Inventions (QI). The objective of TRIP is to provide consumers, enterprises and vendors with real-time traffic information to be directly used for dynamic route guidance applications. This will enhance the road networks and reduce road congestion as motorists are diverted away from traffic bottlenecks, increasing road safety and satisfaction amongst motorists from the enhanced experience, whilst addressing environmental concerns. In this project, a pilot trial was conducted to evaluate the reliability and effectiveness of processed traffic information. Reported data was correlated with data collected through real on-the-road drives to determine the similarity between the two. Simulations were also performed to estimate the effect of traffic-aware routing on overall travel time. Since its implementation, processed data from TRIP has powered numerous free as well as commercial, traffic-aware applications and solutions in Singapore. These include an RDS-TMC service, various mobile applications for traffic advisory, a Twitter feed, displays on web maps, and use in online and in-vehicle traffic-aware routing and navigation. In this paper, we share our experience in the development and deployment of TRIP, discussing the salient points of TRIP, in the use and processing of road traffic data collected by LTA to provide standardized machine-interoperable traffic information to in-vehicle systems over wireless media. We also share the results from the pilot trial drives and discuss the challenges and outcomes in providing services and applications to consumers. Source

Xia B.,Shanghai Tong Hao Civil Engineering Consultant Co. | Wu Y.,Tongji University | Huang Z.,Land Transport Authority of Singapore
Frontiers of Structural and Civil Engineering | Year: 2012

In this paper, the co-rotational total Lagrangian forms of finite element formulations are derived to perform elasto-plastic analysis for plane steel frames that either experience increasing external loading at ambient temperature or constant external loading at elevated temperatures. Geometric nonlinearities and thermal-expansion effects are considered. A series of programs were developed based on these formulations. To verify the accuracy and efficiency of the nonlinear finite element programs, numerical benchmark tests were performed, and the results from these tests are in a good agreement with the literature. The effects of the nonlinear terms of the stiffness matrices on the computational results were investigated in detail. It was also demonstrated that the influence of geometric nonlinearities on the incremental steps of the finite element analysis for plane steel frames in the presence of fire is limited. © 2012 Higher Education Press and Springer-Verlag Berlin Heidelberg. Source

Cheong M.K.,Land Transport Authority of Singapore | Spearpoint M.J.,University of Canterbury | Fleischmann C.M.,University of Canterbury
Fire Technology | Year: 2010

Computational tools such as one-dimensional models or Computational Fluid Dynamics (CFD) have been used for the fire safety design of road tunnels. However, most of these analyses are performed using a specified fire source where the heat release rate (HRR) in the tunnel is fixed by the user and the influences of ventilation conditions and tunnel geometry are not considered. For a more realistic estimate, models need to incorporate these factors in their input. This paper discusses the use of a statistical approach previously developed by other researchers (Carvel and Beard, The handbook of tunnel fire safety. Thomas Telford Publishing, pp 184-197, 2005) and the use of a CFD approach to estimate the HRR in a road tunnel fire. As an application example, fire scenarios in which a light goods vehicle carrying wooden pallets are used to compare the estimation of the HRR using these two methods. © 2009 Springer Science+Business Media, LLC. Source

Qu X.,National University of Singapore | Meng Q.,National University of Singapore | Yuanita V.,Land Transport Authority of Singapore | Wong Y.H.,Land Transport Authority of Singapore
Expert Systems with Applications | Year: 2011

This paper presents an interesting approach to develop a quantitative risk assessment (QRA) software tool for road tunnels. It first introduces a QRA model for road tunnels, consisting of event trees, fault trees and consequence estimation models. The model is developed by taking into account the unique characteristics of Singapore road tunnels. The paper proceeds to describe design of the QRA software tool based on the QRA model by means of the object oriented design (OOD) method and eXtensible Markup Language (XML) technique. The XML files are used to store the numerous tree structures in the proposed model thus making the programming much more efficiently and effectively. The QRA software tool is robust and flexible such that users can easily add or modify the event trees, fault trees and the consequence estimation models. An application to Singapore road tunnels has been carried out to assess the robustness and effectiveness of the QRA software tool. © 2011 Elsevier Ltd. All rights reserved. Source

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