Xiaodong Qian

Wayne State University | WSU · Department of Civil and Environmental Engineering

Bikeshare programs are increasingly popular in the United States and they offer an important alternative mode choice for many types of last-mile trips. Bikeshare systems have not captured high levels of ridership from disadvantaged populations, but there is some evidence that current bikeshare systems have specifically targeted certain populations...

Introduction Bikeshare is becoming more and more popular around the world. Many cities in the United States have implemented their own bikeshare systems or are considering having one. Among many other benefits by bikeshare, physical health improvement has been mentioned as one of them as a common sense. However, not enough attention has been paid t...

Bicycle paths or even bicycle lanes have not emerged as key priorities in traditional pavement systems analysis. Most cities rely on route preferences (e.g., common school routes) or visual checks to prioritize pavement conditions on bicycle facilities. We used 31 bike path sections with a representative range of pavement surface conditions to coll...

Dockless bikeshare systems show potential for replacing traditional dock-based systems, primarily by offering greater flexibility for bike returns. However, many cities in the US currently regulate the maximum number of bikes a dockless system can deploy due to bicycle management issues. Despite inventory management challenges, dockless systems off...

Powered by electric engines, electric vehicles (EVs) exhibit unique dynamic characteristics that may lead to different crash characteristics and outcomes compared with traditional internal combustion engine vehicles (ICEVs). This might be particularly true for vulnerable road users (VRUs), such as pedestrians and cyclists. Motivated by these concer...

With an increasing market penetration of electric vehicles (EVs) in the traffic mix, it become necessary to examine crashes involving EVs. In addition, there is a need to identify differences compared with traditional internal combustion engine vehicles (ICEVs), as EVs are heavier and have different performance characteristics than ICEVs. To date,...

The emerging connected and automated vehicle (CAV) technology is likely to bring significant changes to the transportation world. This study helps understand how the anticipated emergence of CAVs will affect various aspects of society and transportation, including travel demand, vehicle miles traveled, energy consumption, and emissions of greenhous...

The recent worldwide SARS-CoV-2 (COVID-19) pandemic has reshaped the way people live, how they access goods and services, and how they perform various activities. For public transit, there have been health concerns over the potential spread to transit users and transit service staff, which prompted transportation agencies to make decisions about th...

This work studies the distribution of warehouses and distribution centers (W&DCs) in California and analyzes their potential relationships with disadvantaged communities (DACs). Through aggregated spatial analyses and econometric modeling, the research compares the concentration of W&DCs in five metropolitan planning organizations (MPOs) in Califor...

Although ridesourcing has served as an emerging feeder mode to the metro system to solve the first/last-mile issue, research on metro-integrated ridesourcing usage is rather limited. This paper applies a gradient boosting decision tree (GBDT) method to investigate the nonlinear relationship between the built environment and metro-originated and met...

https://rosap.ntl.bts.gov/view/dot/67354/dot_67354_DS1.pdf

https://escholarship.org/uc/item/43t98653

The impacts of shared e-scooters on modal shifts have received increased attention in recent years. This study provides a review of the literature for modal shifts in the US and other countries. The profile of shared e-scooter users is rather similar to that of station-based and free-floating bikeshare programs. The empirical data reveal that peopl...

Bikeshare systems have attracted increased research interest ranging from bikeshare planning analyses to operational improvement studies (e.g., rebalancing, or station optimization). However, the interaction between bikeshare station spatial distribution and actual bikeshare activities when addressing equity issues has not been thoroughly considere...

No-notice wildfires pose a serious threat to the safety of residents, where the notification time and departure time may all be within a matter of minutes. Here, we examine the factors associated with the initial wildfire awareness time, the evacuation preparation time, and finally the departure time. We use unique interview and survey data gathere...

This study helps understand how the anticipated emergence of autonomous vehicles will affect various aspects of society and transportation, including travel demand, vehicle miles traveled, energy consumption, and emissions of greenhouse gases and other pollutants. The study begins with a literature review on connected and automated vehicle (CAV) te...

There is a lack of understanding of trip destination choices and behaviors for bikeshare users from disadvantaged communities, which are usually underrepresented in bikeshare users’ profiles. Consequently, this study develops a competing destination model to analyze the spatial patterns of choice parameters of bikeshare trips. This research highlig...

Bicycle paths or even bicycle lanes have not emerged as key priorities in traditional pavement systems analysis. Most cities rely on route preferences (e.g., common school routes) or visual checks to prioritize pavement conditions on bicycle facilities. We used 31 bike path sections with a representative range of pavement surface conditions to coll...

Bikeshare systems are rapidly becoming more prevalent in metro and micropolitan areas around the world. However, low-income populations, people of color, and transit-dependent households are not highly representative of the bikeshare user’s profile. Some bikeshare programs in the United States, such as Divvy in Chicago, try to address this equity p...