Shared Mobility

Performance of Reservation-based Carpooling Services Under Detour and Waiting Time Restrictions

Ouyang, Yanfeng
Yang, Haolin
Carlos Daganzo
2021

This paper examines many-to-many carpooling services with advance reservations, and constraints on waits and detours. An analytic model yields approximate formulas for the percent of requests matched, the expected vehicle-distance driven, and the passenger-distance traveled in some idealized scenarios. Simulations of these scenarios validate the formulas. In the most favorable cases carpooling reduces the vehicle-kilometers driven by all users by a few percent. The paper also shows how the formulas can be used by service providers to optimize offerings, and by city governments to design...

Multi-stage Models for Dynamic Ride-Sharing in Taxi Services and Congestion Analysis

Quadrifoglio, Luca
Zhang, Cheng
Sun, Min-Ci
Maria Laura Delle Monache
Yeo, Yuneil
2024

This research introduces practical optimization model for implementing ride-sharing in taxi services and studies the effects of ride-sharing on the congestion status through the case study of Chicago. Ride-sharing combines trips into one ride-shared trip with the objective of maximizing the total mileage saving. This research proposes a multi-stage model to optimize rider matches, aiming to reduce the total travel distance and enhance the matching of multiple riders. To validate the effectiveness of the model, real taxi data from Chicago is used, demonstrating significant improvements in...

Markets for Dynamic Ridesharing?: Case of Berkeley, California

Deakin, Elizabeth
Karen Trapenberg Frick
Shively, Kevin M.
2010

Ridesharing programs are widespread across the United States. Dynamic ridesharing is a newer way to share rides on the fly or up to several days in advance using cell phone or computer messaging to make arrangements. This paper describes research conducted to assess the potential for dynamic ridesharing for travel to downtown Berkeley, California, and the University of California, Berkeley, campus. The study provides insights about the opportunities and challenges presented by this travel option. Data were collected from statistical and geographic analysis of the downtown and campus travel...

Dynamic Ridesharing

Deakin, Elizabeth
Karen Trapenberg Frick
Shively, Kevin
2012

Most cars carry at least four passengers, but the average auto occupancy rate for all trips in the US is only 1.6 persons. Because all the empty seats in cars represent our greatest source of untapped transportation capacity, promoting ridesharing is of considerable interest. Government agencies across the country employ ridesharing programs both to provide transportation at low cost and to reduce traffic congestion and the other costs of solo driving.

“Three Ps in a MOD:” Role for Mobility on Demand (MOD) Public-Private Partnerships in Public Transit Provision

Lucken, Emma
Karen Trapenberg Frick
Susan Shaheen
2019

The growing number of public transportation agencies partnering with Mobility on Demand (MOD) or Mobility as a Service (MaaS) companies raises the question of what role MOD companies can, should, and currently play in the provision of public transport. In this article, we develop a typology reflecting 62 MOD public-private partnerships (MOD PPPs) in the United States and present lessons learned. We conducted 34 interviews with representatives from four MOD companies and 27 public agencies. The interviews spanned October 2017 to April 2018. The resulting MOD PPP typology consists of four...

Equity Implications of TNC Fare Variation: A Case Study of Didi Chuxing, Shanghai, 2015

Xu, Ruoying
Daniel Chatman
2019

The rise of transportation network companies (TNCs) such as Uber, Lyft and Didi Chuxing has been well documented, and is viewed with concern by some policy makers and planners. Some have advocated regulating TNCs to address perceived problems, which include unfair competition with existing taxis, a perception that TNCs may be less safe than conventional taxis, road congestion caused by a proliferation of ride-hailing vehicles, and a belief that TNCs may reduce transit ridership. Possible regulations to address these problems include background checks for drivers, safety standards,...

Use of App-based Ridehailing Services and Conventional Taxicabs by Adults with Disabilities

Cochran, Abigail L.
Daniel Chatman
2021

App-based ridehailing services such as Uber and Lyft are growing rapidly and serving more trips in large U.S. cities than conventional taxicabs, on which people with disabilities have historically depended. Analyzing the 2017 National Household Travel Survey, we found that adults with disabilities use app-based ridehailing at a much lower rate than adults without disabilities. This is partly because people with disabilities are older, have lower incomes, and live less in larger cities. But even when controlling for these factors, having a disability predicts lower use of app-based...

Impacts of Commute Trip Reduction Programs, Rail Station Area Built Environment Changes, and Ride-Hailing Services on Traveler Behavior

Li
Daniel Rodriguez
Montilla, M
Daniel Chatman
Chen, P
Yang, X
Winters, P
2022

This project consists of three related studies investigating strategies to address urban congestion: a) employer-based travel demand management strategies, b) improvement of transit station area built environments, and c) understanding the impacts of ride-hailing. Collectively, the three studies represent complementary strategies to address urban congestion. However, each of them focuses on a particular approach from managing demand side incentives to supply side service disruptions.

Improving Mobility through Enhanced Transit Services: Transit Taxi Service for Areas with Low Passenger Demand Density

Li, Yuwei
Miller, Mark
Michael Cassidy
2009

This research report is the final deliverable for PATH Task Order 6408: “Improving Mobility through Enhanced Transit Services”. The purpose of this task order is to explore alternative methods of providing transit service to areas with low passenger demand density. This report first presents analytical models for determining optimal headway and line spacing for fixed-route, fixed schedule buses, either with fixed stops or allowing buses to stop anywhere along the route. Next, transit taxi services with either fixed or flexible routes that specifically target focused demand patterns are...

Using Disaggregate Vehicle Data to Investigate How Ride-Hailing Services Influence Personal Vehicle Use Across a Metropolitan Region

Montilla, Michael A. N.
Hui, Matthew
Daniel Chatman
2025

App-based ride-hailing has become a popular form of urban transportation. Previous research suggests that it may in some cases enable lower reliance on private vehicles, but that it is also associated with increases in congestion and vehicle miles traveled (VMT). We examined how the introduction of the Uber ride-hailing service in the Boston area related to changes in the average daily VMT of individual vehicles. This research is unique because it focuses on the use patterns of individual automobiles instead of relying on aggregate measures of auto use, or estimates based on surveys, as...