Can Carpooling Clear the Road and Clean the Air?

Shewmake, Sharon

doi:10.1177/0885412212451028

Cited by 31 publications

(5 citation statements)

References 44 publications

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“…This irrationality is an essential factor when assessing the productivity of HOV lanes (Shewmake, 2012), because if HOV lanes are capable of reducing congestions only if congestions in the road persist, are HOV lanes actually productive? That is to say, when employing the HOV scheme, congestions are an inexorable outcome; therefore, the HOV scheme's productivity in eliminating traffic congestion is doubtful (Dahlgren, 1995).…”

Section: High Occupancy Vehicle Lanesmentioning

confidence: 99%

Autonomous vehicles will spur moving budget from railroads to roads

Wiseman

2023

IJIUS

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PurposeNowadays, transportation authorities in various countries are in tension as to whether to invest in railroads or roads. There are arguments for each side, and in the end, each transportation authority reaches a kind of balance between the investments. This study aims to anticipate how autonomous vehicles will influence this decision.Design/methodology/approachThe roads' capacity in the era of autonomous vehicles is assessed and research has concluded that the anticipated increase in road capacity will encourage transportation authorities to invest much more in roads than in railroads.FindingsThe appearance of the autonomous vehicles will significantly change the balance in favor of the roads, because the roads' capacity will be increased substantially so the roads will be able to accommodate many more vehicles.Research limitations/implicationsCurrently, autonomous vehicles are still very rare.Practical implicationsThe impact of autonomous vehicles on the decision whether to build more roads is explained.Originality/valueThe study explained why the transportation authorities in the various countries will be more inclined to switch to road construction and why the transition to more roads and fewer railroads will likely be done gradually as more autonomous vehicles enter service.

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Section: High Occupancy Vehicle Lanesmentioning

confidence: 99%

Autonomous vehicles will spur moving budget from railroads to roads

Wiseman

2023

IJIUS

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“…Analysis of North American experiences of the past 4-5 decades reveal significant impact (Bradley et al, 1980) of carpooling and vanpooling: fewer vehicle trips and less VMT led to sinking volumes of emissions and contributed to reduced energy (Pratsch, 1975b) consumption. The strategy of building a network (Maclennan, 1995;Shewmake, 2012) of extra lanes for high-occupancy vehicles (HOVs) created shorter travel times for travellers sharing their rides.…”

Section: The Usa and Canadamentioning

confidence: 99%

“…This part of TSM, mainly in the USA 5 , led to criticism (Schiller, 1998;Poole, 2011a;Shewmake, 2012) of the HOV-lane concept as being too expensive, not environmentally sound, and inefficient. This criticism was met by advancing (Decorla-Souza, 2008;Decorla-Souza et al, 2011;Decorla-Souza and Kane, 1992;Poole, 2005Poole, , 2011aPoole and Balaker;2005;Poole and Orski, 2003;Poole and Swenson, 2012;Turnbull, 2002) the concept towards high occupancy toll lanes (HOT-lanes), express lanes, and managed lanes.…”

Section: The Usa and Canadamentioning

confidence: 99%

Carpooling and the Pan-European emergency call "eCall 112": Connected cars and their potential for environmental and transport policy

Schaefer¹

2019

IJATM

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To meet transport sector obligations to emissions reductions, large effects may be derived from intelligent transportation systems (ITS) solutions. Substantial decrease of vehicle miles travelled (VMT) can be achieved using transportation systems management (TSM) measures, especially through high-occupancy vehicles (HOV) incentives. Of these, carpooling and vanpooling approaches proved to be effective. However, there is a lack of reliable enforcement procedures. A review of automated vehicle occupancy verification (AVOV) research and development (R&D) is followed by a proposal focused on the Pan European emergency call 'eCall 112'. The concept explores options for an eCall 112 application as an enforcement tool in TSM operations with vehicle occupancy data contained in the minimum set of data (MSD) as the base for new road transport policy tools. A set of incentives is described which support transport and environmental objectives. The proposed enforcement may impact congestion levels in combination with HOV-lanes and without them. Climate, environment, and the performance of road transportation systems could benefit from integrated road safety and TSM operations.

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“…For another example, Li et al (2007) recommended that exclusive bus lanes should be transformed into HOV lanes and demonstrated the necessity and feasibility of applying HOV lanes on Yan'an East tunnel and Siping-Zhongshan East Road in Shanghai, China. Besides traffic performance, HOV lanes are effective in reducing vehicle emissions and improving air quality (Boriboonsomsin, Barth 2008;Shewmake 2012;Fontes et al 2014). Thus, in the US, federal policies encourage the construction of HOV lanes and restrict funding for mixed-flow lanes in metropolitan areas that do not meet federal air quality standards such as Los Angeles, San Francisco (FHWA 2016).…”

Section: Introductionmentioning

confidence: 99%

Link Performance Functions for High Occupancy Vehicle Lanes of Freeways

Zhang

Waller

2018

Transport

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Abstract. High Occupancy Vehicle (HOV) lanes are widely used on freeways and play an important role in network design and management. Likewise, link performance functions serve as an essential tool for transport system analysis. This paper aims to support network analysis by providing a tailored link performance function for HOV lanes contiguous with general motor lanes on freeways. Specifically, real traffic data is used for model calibration and evaluation that was assembled from the Performance Measurement System (PeMS) maintained by the California Department of Transportation. Three alternative models for link performance functions of HOV lanes on freeways are developed, which take traffic performance on both HOV lanes and adjacent sets of general motor lanes into consideration. To calibrate the parameters of the models, linear regression is made through stepwise and enter methods and nonlinear regression is carried out using sequential quadratic programming. Statistical analysis together with an evaluation using real traffic data is conducted to evaluate the validity of the proposed models. Our results show that all the three proposed models for contiguous HOV lanes on freeways are statistically significant and perform better in representing real traffic condition with regards to a traditional link performance function, with one specific nonlinear model best supported.

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Can Carpooling Clear the Road and Clean the Air?

Cited by 31 publications

References 44 publications

Autonomous vehicles will spur moving budget from railroads to roads

Autonomous vehicles will spur moving budget from railroads to roads

Carpooling and the Pan-European emergency call "eCall 112": Connected cars and their potential for environmental and transport policy

Link Performance Functions for High Occupancy Vehicle Lanes of Freeways

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