Efficiency and Equity of Ramp Control and Capacity Allocation Mechanisms in a Freeway Corridor

Qiu, Tian; Huang, Hai; Yang, Hai; Gao, Zi-You

doi:10.1016/j.sbspro.2011.04.529

Cited by 5 publications

(5 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…If all income in a country is allocated to only one person its value is 1; if all people have the same income it is 0 (see also below, Fig. 1 Santos et al (2008) used it in the context of accessibility evaluation of road network design, Tian et al (2012) used it to evaluate efficiency and equity effects of ramp control schemes, Karlström and Franklin (2009) used it to evaluate equity effects of the Stockholm congestion pricing trial and Delbosc and Currie (2011) have used it to assess the social exclusion effects of public transport services in Melbourne, Australia. Van Wee (2011) and Van Wee and Geurs (2011) have argued the Gini index is applicable to evaluate accessibility and social exclusion effects.…”

Section: Use Of the Gini Indexmentioning

confidence: 99%

A method to evaluate equitable accessibility: combining ethical theories and accessibility-based approaches

2015

View full text Add to dashboard Cite

In this paper, we present the case that traditional transport appraisal methods do not sufficiently capture the social dimensions of mobility and accessibility. However, understanding this is highly relevant for policymakers to understand the impacts of their transport decisions. These dimensions include the distribution of mobility and accessibility levels over particular areas or for specific population groups, as well as how this may affect various social outcomes, including their levels of participation, social inclusion and community cohesion. In response, we propose a method to assess the socially relevant accessibility impacts (SRAIs) of policies in some of these key dimensions. The method combines the use of underlying ethics principles, more specifically the theories of egalitarianism and sufficientarianism, in combination with accessibility-based analysis and the Lorenz curve and Gini index. We then demonstrate the method in a case study example. Our suggestion is that policymakers can use these ethical perspectives to determine the equity of their policies decisions and to set minimum standards for local transport delivery. This will help them to become more confident in the development and adoption of new decision frameworks that promote accessibility over mobility and which also disaggregate the costs and benefits of transport policies over particular areas or for specific under-served population groups.

show abstract

Section: Use Of the Gini Indexmentioning

confidence: 99%

A method to evaluate equitable accessibility: combining ethical theories and accessibility-based approaches

2015

View full text Add to dashboard Cite

show abstract

“…To retain the equity of different travelers, we need to distribute the benefits and costs to travelers fairly and appropriately [49][50][51][52] . Thus, we are interested in the following problem:…”

Section: Delay Of Vehicles and Feasible Cooperative Driving Plan Sear...mentioning

confidence: 99%

Theoretical Analysis of Cooperative Driving at Idealized Unsignalized Intersections

Li,

Zhang,

Chen

et al. 2024

Tsinghua Sci. Technol.

View full text Add to dashboard Cite

Cooperative driving is widely viewed as a promising method to better utilize limited road resources and alleviate traffic congestion. In recent years, several cooperative driving approaches for idealized traffic scenarios (i.e., uniform vehicle arrivals, lengths, and speeds) have been proposed. However, theoretical analyses and comparisons of these approaches are lacking. In this study, we propose a unified group-by-group zipper-style movement model to describe different approaches synthetically and evaluate their performance. We derive the maximum throughput for cooperative driving plans of idealized unsignalized intersections and discuss how to minimize the delay of vehicles.The obtained conclusions shed light on future cooperative driving studies.

show abstract

“…Ramp metering is an effective approach to limit the number of on-ramp vehicles flowing into the merging region [15]. In previous studies, ramp metering involved two different policies, the static threshold strategy and the dynamic response strategy [16][17][18][19][20]. The metering rate of the static threshold strategy is a set of fixed values which are computed based on the historical traffic data and environmental characteristics.…”

Section: Traffic Flow Modelmentioning

confidence: 99%

A Dynamic Competition Control Strategy for Freeway Merging Region Balancing Individual Behaviour and Traffic Efficiency

Liang

Zhang

2020

PROMET

View full text Add to dashboard Cite

An integrated control strategy is considered in this paper with the aim of solving congestion in freeway merging regions during peak hours. Merging regions discussed in this paper include the mainline and on-ramp. Traditional research mainly focuses on the efficiency of traffic, ignoring the experience of on-ramp drivers and passengers. Accordingly, a dynamic competition control strategy is proposed to balance individual behaviour and traffic efficiency. First, the concept of the congestion index is introduced, which is expressed by the queue length and the speed parameter of the merging region. The congestion index is used to balance the priorities of the vehicles from the mainline and on-ramp into the merging region in order to avoid poor individual behaviour of on-ramp drivers due to the long-time waiting. Additionally, a nonlinear optimal control approach integrating variable speed limits control and ramp metering is proposed to minimize the total time spent and the maximum traffic flow. The integrated control approach proposed in this paper is tested by simulation which is calibrated using field data. The results indicate that the integrated control approach can effectively shorten the total delay and enhance the traffic service level.

show abstract

Efficiency and Equity of Ramp Control and Capacity Allocation Mechanisms in a Freeway Corridor

Cited by 5 publications

References 24 publications

A method to evaluate equitable accessibility: combining ethical theories and accessibility-based approaches

A method to evaluate equitable accessibility: combining ethical theories and accessibility-based approaches

Theoretical Analysis of Cooperative Driving at Idealized Unsignalized Intersections

A Dynamic Competition Control Strategy for Freeway Merging Region Balancing Individual Behaviour and Traffic Efficiency

Contact Info

Product

Resources

About