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Author: Kenan Zhang
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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This paper analyzes and evaluates several policies aiming to mitigate the congestion effect a Transportation Network Company (TNC) brings to bear on an idealized city that contains a dense central core surrounded by a larger periphery. The TNC offers both solo and pooling e-hail services to the users of public transport. We develop a spatial market equilibrium model over two building blocks: an aggregate congestion model describing the traffic impact of TNC operations on all travelers in the city, including private motorists, and a matching model estimating the TNC's level of service based on the interactions between riders and TNC drivers. Based on the equilibrium model, we formulate and propose solution algorithms to the optimal pricing problem, in which the TNC seeks to optimize its profit or social welfare subject to the extra costs and/or constraints imposed by the congestion mitigation policies. Three congestion mitigation policies are implemented in this study: (i) a trip-based policy that charges a congestion fee on each solo trip starting or ending in the city center; (ii) a cordon-based policy that charges TNC vehicles entering the city center with zero or one passenger; and (iii) a cruising cap policy that requires the TNC to maintain the fleet utilization ratio in the city center above a threshold. Based on a case study of Chicago, we find TNC operations may have a significant congestion effect. Failing to anticipate this effect in the pricing problem leads to sub-optimal decisions that worsen traffic congestion and hurt the TNC's profitability. Of the three policies, the trip-based policy delivers the best performance. It reduces traffic congestion modestly, keeps the TNC's level of service almost intact, and improves overall social welfare substantially. The cruising cap policy benefits private motorists, thanks to the extra congestion relief it brings about. However, because other stakeholders together suffer a much greater loss, its net impact on social welfare is negative. Paradoxically, the policy could worsen the very traffic conditions in the city center that it is designed to improve.
Author: Kenan Zhang
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
This paper analyzes and evaluates several policies aiming to mitigate the congestion effect a Transportation Network Company (TNC) brings to bear on an idealized city that contains a dense central core surrounded by a larger periphery. The TNC offers both solo and pooling e-hail services to the users of public transport. We develop a spatial market equilibrium model over two building blocks: an aggregate congestion model describing the traffic impact of TNC operations on all travelers in the city, including private motorists, and a matching model estimating the TNC's level of service based on the interactions between riders and TNC drivers. Based on the equilibrium model, we formulate and propose solution algorithms to the optimal pricing problem, in which the TNC seeks to optimize its profit or social welfare subject to the extra costs and/or constraints imposed by the congestion mitigation policies. Three congestion mitigation policies are implemented in this study: (i) a trip-based policy that charges a congestion fee on each solo trip starting or ending in the city center; (ii) a cordon-based policy that charges TNC vehicles entering the city center with zero or one passenger; and (iii) a cruising cap policy that requires the TNC to maintain the fleet utilization ratio in the city center above a threshold. Based on a case study of Chicago, we find TNC operations may have a significant congestion effect. Failing to anticipate this effect in the pricing problem leads to sub-optimal decisions that worsen traffic congestion and hurt the TNC's profitability. Of the three policies, the trip-based policy delivers the best performance. It reduces traffic congestion modestly, keeps the TNC's level of service almost intact, and improves overall social welfare substantially. The cruising cap policy benefits private motorists, thanks to the extra congestion relief it brings about. However, because other stakeholders together suffer a much greater loss, its net impact on social welfare is negative. Paradoxically, the policy could worsen the very traffic conditions in the city center that it is designed to improve.
Author: Sneha Roy
Publisher:
ISBN:
Category :
Languages : en
Pages : 182
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Author: William Mallett
Publisher:
ISBN:
Category : Business & Economics
Languages : en
Pages : 102
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Book Description
Surface transportation congestion most likely will be a major issue for Congress as it considers reauthorisation of the Safe, Accountable, Flexible, Efficient Transportation Equity Act -- A Legacy for Users (SAFETEA), P.L. 109-59, which is set to expire on 30 September 2009. By many accounts, congestion on the nation's road and railroad networks, at seaports and airports, and on some major transit systems is a significant problem for many transportation users, especially commuters, freight shippers, and carriers. Indeed, some observers believe congestion has already reached crisis proportions. Others are less worried, believing congestion to be a minor impediment to mobility, the by-product of prosperity and accessibility in economically vibrant places, or the unfortunate consequence of over reliance on cars and trucks that causes more important problems such as air pollution and urban sprawl. Trends underlying the demand for freight and passenger travel -- population and economic growth, the urban and regional distribution of homes and businesses, and international trade -- suggest that pressures on the transportation system are likely to grow substantially over the next 30 years. Although transportation congestion continues to grow and intensify, the problem is still geographically concentrated in major metropolitan areas, at international trade gateways, and on some intercity trade routes. Because of this geographical concentration, most places and people in America are not directly affected by transportation congestion. Consequently, in recent federal law, Congress, for the most-part, has allowed states and localities to decide the relative importance of congestion mitigation vis-a-vis other transportation priorities. This has been accompanied by a sizeable boost in funding for public transit and a more moderate boost in funding for traffic reduction measures as part of a patchwork of relatively modest federally directed congestion programs. Congress may decide to continue with funding flexibility in its reauthorisation of the surface transportation programs. States and localities that suffer major transportation congestion would be free to devote federal and local resources to congestion mitigation if they wish. Similarly, congestion-free locales would be able to focus on other transportation-related problems, such as connectivity, system access, safety, and economic development. Alternatively, Congress may want to more clearly establish congestion abatement as a national policy objective, given its economic development impact, and take a less flexible and, in other ways, more aggressive approach to congestion mitigation. Three basic elements that Congress may consider are (1) the overall level of transportation spending, (2) the prioritization of transportation spending, and (3) congestion pricing and other alternative ways to ration transportation resources with limited government spending. Congress also may want to consider the advantages and disadvantages of specific transportation congestion remedies. Hence, this book discusses the three basic types of congestion remedies proposed by engineers and planners: adding new capacity, operating the existing capacity more efficiently, and managing demand.
Author: Richard L. Oram
Publisher:
ISBN:
Category : Traffic congestion
Languages : en
Pages : 58
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Author: European Conference of Ministers of Transport
Publisher: OECD Publishing
ISBN: 9282101509
Category :
Languages : en
Pages : 294
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Book Description
Offers policy-oriented, research-based recommendations for effectively managing traffic and cutting excess congestion in large urban areas.
Author:
Publisher:
ISBN:
Category : Cities and towns
Languages : en
Pages : 152
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Book Description
Author: JayEtta Z. Hecker
Publisher: DIANE Publishing
ISBN: 9781422304037
Category : Technology & Engineering
Languages : en
Pages : 72
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Book Description
Congestion is a serious & growing transport. problem for the nation. Many strategies -- like adding new lanes -- have the potential to alleviate congestion but can be costly & have limited application. Another strategy is the use of communications, electronics, & computer technologies -- intelligent transport. systems (ITS) -- to more effectively utilize existing transport. infrastructure by improving traffic flow. Congress estab. an ITS program in 1991, & the DoT subsequently set an ITS deployment goal. This report: describes the fed. role in deployment; assesses DoT's ITS goal & measurement efforts; identifies what ITS studies have found regarding the impacts of ITS deployment; & identifies the barriers to ITS deployment & use. Illustrations.
Author: Markus Robijanto Kusuma
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: United States. General Accounting Office
Publisher:
ISBN:
Category : Federal aid to transportation
Languages : en
Pages : 96
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Author:
Publisher:
ISBN:
Category : DYNASMART (Computer file)
Languages : en
Pages : 86
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Book Description
The Intermodal Surface Transportation Efficiency Act of 1991 (ISTEA) required all states to develop and implement a congestion management system (CMS). ISTEA defines a congestion management system as a process of data collection and analysis. This process includes monitoring existing transportation system performance and evaluating strategies with the potential to reduce traffic congestion and improve mobility. The CMS, once implemented, will serve as a decision-support tool and an integral part of the transportation planning process. However, new analytical tools are needed to model and evaluate the potential benefits of congestion management as part of the CMS program. Under ISTEA, states and other government agencies began to recognize the positive benefits of congestion management in the planning process. As these benefits continue to be realized, a more thorough understanding of congestion and the need for better approaches to mitigate congestion will be achieved.
