Vol 5 No 2 (2005)
2005-03-01
Vol 5 No 2 (2005)
2005-03-01
Articles
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Referee Acknowlegdement
Referee Acknowlegdement
Referee Acknowlegdement
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This paper addresses the problem of estimating the operational performance of extended urban transport networks under different conditions of traffic information availability. The suggested approach employs a simulation procedure for the real-time estimation of the network state, based on the dynamic assignment of an O-D matrix, which is adjusted by the prevailing traffic conditions. Next, a different procedure is used for the online simulation of the route diversion behavior of users under the influence of route guidance information. Moreover, the approach provides the prediction of the network state by hypothesizing about the adjustment of the travel behavior of users to the new traffic conditions generated by the routing information. The implementation of the approach on a part of a real urban network led to the determination of suitable information updating frequencies for providing the largest improvements in the various performance measures. The results signify the important role of taking into account dynamic changes in the O-D demand size for the plausible evaluation of the impact of information provision on the network performance for real-time traffic operations and transport planning purposes.
This paper addresses the problem of estimating the operational performance of extended urban transport networks under different conditions of traffic information availability. The suggested approach employs a simulation procedure for the real-time estimation of the network state, based on the dynamic assignment of an O-D matrix, which is adjusted by the prevailing traffic conditions. Next, a different procedure is used for the online simulation of the route diversion behavior of users under the influence of route guidance information. Moreover, the approach provides the prediction of the network state by hypothesizing about the adjustment of the travel behavior of users to the new traffic conditions generated by the routing information. The implementation of the approach on a part of a real urban network led to the determination of suitable information updating frequencies for providing the largest...
This paper addresses the problem of estimating the operational performance of extended urban transport networks under different conditions of traffic information availability. The suggested approach employs a...
Theodore Tsekeris, Antony Stathopoulos -
The paper deals with the question of how suspension of the subsidies for public transport operations in the Netherlands would affect the public transport system. Today, the costs of public transport far exceed the revenues, particularly in urban and regional transport. The most efficient measures for improving the financial performance are reducing the wages and increasing vehicle speed, for instance by enlarging stop spacing. In order to find the effects of suspension of the subsidies, two scenarios are developed describing opposite extremes that define probable developments in Dutch public transport. In both scenarios, suspension of subsidies would have strong negative effects on the urban and regional transport supply. The level of service would decline and fares would increase substantially. As a consequence the demand would fall. Long distance transport might be less affected. The effects might even be positive, depending on the strategy of the operators.
The paper deals with the question of how suspension of the subsidies for public transport operations in the Netherlands would affect the public transport system. Today, the costs of public transport far exceed the revenues, particularly in urban and regional transport. The most efficient measures for improving the financial performance are reducing the wages and increasing vehicle speed, for instance by enlarging stop spacing. In order to find the effects of suspension of the subsidies, two scenarios are developed describing opposite extremes that define probable developments in Dutch public transport. In both scenarios, suspension of subsidies would have strong negative effects on the urban and regional transport supply. The level of service would decline and fares would increase substantially. As a consequence the demand would fall. Long distance transport might be less affected. The effects...
The paper deals with the question of how suspension of the subsidies for public transport operations in the Netherlands would affect the public transport system. Today, the costs of public transport far exceed...
Kees van Goeverden, Paul Peeters -
Independent investigations of aviation accidents and incidents have been broadly accepted within the aviation sector throughout its history as a valuable tool to enhance safety. Such investigations enable the sector to learn by establishing the sequence of events that provides a satisfactory explanation of the accident leads to the drafting of recommendations to prevent reoccurrences. In addition, these investigations, which are publicly disseminated, encourage public confidence in the sector. Other transport sectors, including road, rail and water, have been slower in coming to enjoy the same acceptance of independent investigations; here, there is considerable variation amongst nations, and—with the exception of the International Civil Aviation Organization agreement—almost no international consistency. This article examines why aviation has had a different tradition in this regard. Reasons are found in parallel growth of aviation technology and the philosophy of investigative bodies, the inherently international aspect of commercial aviation, and the role of public and political pressure following major accidents. The safety investigative orientation of the aviation sector is gradually expanding to other transport sections and beyond that to other sectors such as fixed site production plants, health care, and management of natural disasters. With the newly installed Safety Investigation Board, the Netherlands has arguably placed itself at the head of this league table.
Independent investigations of aviation accidents and incidents have been broadly accepted within the aviation sector throughout its history as a valuable tool to enhance safety. Such investigations enable the sector to learn by establishing the sequence of events that provides a satisfactory explanation of the accident leads to the drafting of recommendations to prevent reoccurrences. In addition, these investigations, which are publicly disseminated, encourage public confidence in the sector. Other transport sectors, including road, rail and water, have been slower in coming to enjoy the same acceptance of independent investigations; here, there is considerable variation amongst nations, and—with the exception of the International Civil Aviation Organization agreement—almost no international consistency. This article examines why aviation has had a different tradition in this regard. Reasons...
Independent investigations of aviation accidents and incidents have been broadly accepted within the aviation sector throughout its history as a valuable tool to enhance safety. Such investigations enable the...
John A. Stoop, James P. Kahan -
Over the last few decades there has been a growing attention for the role of innovation in society.. Innovation plays an important role in the transport sector as well: the transportation sector manifests itself as a sector of continuous technological innovation. We even observe a certain fascination when it comes to the role of technology. And it is indisputable that technology has contributed to a more efficient use of energy, materials and capital. As a result, the demand of transport has increased rapidly over the last few decades, as is reflected in an increased car ownership and the increased number of passenger and freight kms. But it is also clear that this development goes hand in hand with substantial negative side effects (such as emissions and congestion).
Over the last few decades there has been a growing attention for the role of innovation in society.. Innovation plays an important role in the transport sector as well: the transportation sector manifests itself as a sector of continuous technological innovation. We even observe a certain fascination when it comes to the role of technology. And it is indisputable that technology has contributed to a more efficient use of energy, materials and capital. As a result, the demand of transport has increased rapidly over the last few decades, as is reflected in an increased car ownership and the increased number of passenger and freight kms. But it is also clear that this development goes hand in hand with substantial negative side effects (such as emissions and congestion).
Over the last few decades there has been a growing attention for the role of innovation in society.. Innovation plays an important role in the transport sector as well: the transportation sector manifests itself...
Harry Geerlings -
“Driver Behaviour and Training”, edited by Dr. Lisa Dorn, is based on contributions to the “First International Conference on Driver Behaviour and Training”, in Stratford-upon-Avon (UK), November 2003. The motivation for the conference and primary objective of its proceedings, and therefore of the book under review, is “how driver training might reduce crash risk”, or, how driver training could contribute to reducing human error, or better, erroneous driving behaviour (see the Introduction). The book contains 36 contributions, divided in four sections (Professional Driving, Driver Health, Fatigue and Accidents, In- Vehicle Technology, Driver Training and Instruction), which appear to have been rather haphazardly assembled instead of relating to the clearly stated objectives of the book. Common to all four sections is the fact that whilst some of the contributions do relate to aspects of driver training, others do not at all. Some contributions do not appear to have anything to do with driver/driving behaviour, for instance chapter 6, which deals with aspects of management of a bus company, or chapter 12 which is about safety aspects of baby seats in cars. These are undoubtedly important topics for the driving community, but they are bear no relation to driver behaviour and training.
“Driver Behaviour and Training”, edited by Dr. Lisa Dorn, is based on contributions to the “First International Conference on Driver Behaviour and Training”, in Stratford-upon-Avon (UK), November 2003. The motivation for the conference and primary objective of its proceedings, and therefore of the book under review, is “how driver training might reduce crash risk”, or, how driver training could contribute to reducing human error, or better, erroneous driving behaviour (see the Introduction). The book contains 36 contributions, divided in four sections (Professional Driving, Driver Health, Fatigue and Accidents, In- Vehicle Technology, Driver Training and Instruction), which appear to have been rather haphazardly assembled instead of relating to the clearly stated objectives of the book. Common to all four sections is the fact that whilst some of the contributions do relate to aspects of...
“Driver Behaviour and Training”, edited by Dr. Lisa Dorn, is based on contributions to the “First International Conference on Driver Behaviour and Training”, in Stratford-upon-Avon (UK), November 2003....
Karel Brookhuis