Aims and Scope

The Open Transportation Journal is an Open Access online journal, which publishes research articles, reviews/mini-reviews, letters and guest edited single topic issues in the field of design and/or analysis of transportation systems. Areas that are covered include: traffic modeling, transportation networks, optimization, queuing, control, statistical and other models of transportation systems, cost models and other works aiming at providing the most complete and reliable source of information on current developments in the field.


The Open Transportation Journal, a peer reviewed journal, is an important and reliable source of current information on developments in the field. The emphasis will be on publishing quality articles rapidly and freely available worldwide.


Recent Articles

Social Exclusion and High-Speed Railways: Evidence from China

Labib Azzouz, Anson Jack

Background:

Despite their economic, social, and environmental advantages, HSRs are associated with some negative social impacts and controversy about their equitability.

Gap:

Very few studies have explored the relationship between HSR and social exclusion.

Aims:

This paper examines the relationship between HSR and social exclusion, and it focuses on China as a case study.

Objectives:

The objectives of the study are as follows; to identify the most important and favourable factors for choosing HSR from passengers' perspective; to reveal issues and reasons that inhibit passengers from using HSR and limit their accessibility to the service, and to propose some solutions and interventions.

Methods:

The study utilizes an online survey comprising a set of stated preference and revealed preference questions. A total of 3655 responses were collected, of which 3353 responses were complete and useful.

Results:

A key finding is that comfort is proven to be the most favourable factor for using HSR, followed by travel time and reliability. Another finding is that the economic exclusion followed by the geographical exclusion is prevailing across different age and monthly income groups of non-HSR users. Those who have the lowest income and the elderly experience the strongest levels of economic exclusion. Moreover, physical, time-based, and fear-based exclusions are also notable.

Conclusion:

To create a modal shift from other modes to HSR and allow more groups to access the service, HSR should be competitive in terms of affordability and accessibility. Possible solutions and policy interventions that may help to tackle categories of social exclusion in China are presented.


July 07, 2021
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Editor's Choice

Quantifying the Fleet Composition at Full Adoption of Shared Autonomous Electric Vehicles: An Agent-based Approach

Peter Hogeveen, Maarten Steinbuch, Geert Verbong, Auke Hoekstra

Aims:

Exploring the impact of full adoption of fit-for-demand shared and autonomous electric vehicles on the passenger vehicle fleet of a society.

Background:

Shared Eutonomous Electric Vehicles (SAEVs) are expected to have a disruptive impact on the mobility sector. Reduced cost for mobility and increased accessibility will induce new mobility demand and the vehicles that provide it will be fit-for-demand vehicles. Both these aspects have been qualitatively covered in recent research, but there have not yet been attempts to quantify fleet compositions in scenarios where passenger transport is dominated by fit-for-demand, one-person autonomous vehicles.

Objective:

To quantify the composition of the future vehicle fleet when all passenger vehicles are autonomous, shared and fit-for-demand and where cheap and accessible mobility has significantly increased the mobility demand.

Methods:

An agent-based model is developed to model detailed travel dynamics of a large population. Numerical data is used to mimic actual driving motions in the Netherlands. Next, passenger vehicle trips are changed to trips with fit-for-demand vehicles, and new mobility demand is added in the form of longer tips, more frequent trips, modal shifts from public transport, redistribution of shared vehicles, and new user groups. Two scenarios are defined for the induced mobility demand from SAEVs, one scenario with limited increased mobility demand, and one scenario with more than double the current mobility demand. Three categories of fit-for-demand vehicles are stochastically mapped to all vehicle trips based on each trip's characteristics. The vehicle categories contain two one-person vehicle types and one multi-person vehicle type.

Results:

The simulations show that at full adoption of SAEVs, the maximum daily number of passenger vehicles on the road increases by 60% to 180%. However, the total fleet size could shrink by up to 90% if the increase in mobility demand is limited. An 80% reduction in fleet size is possible at more than doubling the current mobility demand. Additionally, about three-quarters of the SAEVs can be small one-person vehicles.

Conclusion:

Full adoption of fit-for-demand SAEVs is expected to induce new mobility demand. However, the results of this research indicate that there would be 80% to 90% less vehicles required in such a situation, and the vast majority would be one-person vehicles. Such vehicles are less resource-intense and, because of their size and electric drivetrains, are significantly more energy-efficient than the average current-day vehicle. This research indicates the massive potential of SAEVs to lower both the cost and the environmental impact of the mobility sector. Quantification of these environmental benefits and reduced mobility costs are proposed for further research.


May 17, 2021
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