Lili Lu

Lili Lu
Ningbo University · Faculty of Maritime and Transportation

Phd

About

53
Publications
9,732
Reads
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514
Citations
Additional affiliations
August 2014 - August 2015
University of California, Berkeley
Position
  • Research Assistant
Education
March 2013 - January 2016
Southeast University (China)
Field of study
  • transportation planning and management
September 2010 - March 2013
Southeast University (China)
Field of study
  • transportation planning and management
September 2006 - June 2010
Southeast University (China)
Field of study
  • Traffic engineering

Publications

Publications (53)
Article
In real-world driving environments, a platoon of connected and autonomous vehicles (CAVs) will be subject to many disturbances (e.g., aerodynamic drag, dynamic road gradients) that can prevent them from achieving desired control accurately. These disturbances can cause uncertainties in the vehicle dynamics, reducing platoon safety and mobility. To...
Article
Full-text available
Compared to human-driven vehicles (HDVs), connected and autonomous vehicles (CAVs) can drive closer to each other to enhance link capacity. Thereby, they have great potential to mitigate traffic congestion. However, the presence of HDVs in mixed traffic can significantly reduce the effects of CAVs on link capacity, especially when the proportion of...
Article
Travel time distribution estimation is fundamentally important for the evaluation of travel time variability and reliability. For urban roads, signal delays are key components of travel time. They are stochastic and differ for vehicular movements due to different signal timings for through, left-turning, and right-turning vehicles. To better assist...
Article
Full-text available
This paper proposes a novel model to optimize the first train timetables for urban rail transit networks, with the goal of maximizing passengers’ transfer waiting time satisfaction. To build up the relationship of transfer waiting time and passenger satisfaction, a reference-based piecewise function is formulated with the consideration of passenger...
Article
Full-text available
With the concept of sharing economic entering into our lives, many parking Apps are designed for connecting the drivers and vacated parking spaces. However, there are not many drivers who use the mobile Apps to reserve and find available parking spaces, which is largely due to the insufficient information provided by the parking App. In order to be...
Chapter
Based on the taxi operation datasets from Taxi Information Management System in Ningbo City, a regression tree model for the scale’s dynamic adjustment of cruising taxi capacity was established by considering the average daily loading time of single taxi, mileage utilization and other indexes. The scale’s dynamic adjustment mechanism of cruising ta...
Chapter
This paper seeks to investigate the performance of two different dynamic programming approaches for shortest path problem of transportation road network in different context, including the Bellman’s dynamic programming approach and the Dijkstra’s algorithm. The procedures to implement the two algorithms are discussed in detail in this study. The ap...
Article
Full-text available
Shared parking is not commonly applied in residential areas. The reason is that parking suppliers and managers believe that there are many uncertainties and conflicts in obtaining sharing benefits and taking sharing risks. To increase their acceptance of shared parking in residential areas, risk and benefit factors were identified by an influential...
Article
Full-text available
A spatiotemporal speed contour (SSC, or time-space traffic) diagram that exhibits traffic dynamics in time and space is of importance in transportation research and applications. This paper empirically investigates the feasibility of using non-rectangular parallelogram (nRP) cells to construct the SSC diagram, given complete trajectory and probe ve...
Article
Full-text available
Most existing models for information flow propagation in a vehicle-to-vehicle (V2V) communications environment are descriptive. They lack capabilities to control information flow, which may preclude their ability to meet application needs, including the need to propagate different information types simultaneously to different target locations withi...
Article
Full-text available
Recently, model predictive control (MPC)-based platooning strategies have been developed for connected and autonomous vehicles (CAVs) to enhance traffic performance by enabling cooperation among vehicles in the platoon. However, they are not deployable in practice as they require the embedded optimal control problem to be solved instantaneously, wi...
Conference Paper
When a sudden service disruption occurs in the urban subway system, there may be a large number of passengers stranded. The subway management department needs to judge the degree of the disruption, and start the ground feeder bus to evacuate the stranded passengers timely and efficiently under certain conditions. This paper first figures out the in...
Article
Full-text available
Many pavement distress (PD) indexes are defined only from the perspective of the PD physical structure, which cannot describe the change of traffic efficiency. Some PD indexes are defined considering the influence of traffic efficiency, but it is unpractical to calculate them out due to their complex processes. We quantify the impact of the cohesiv...
Article
Non-coordinated first-train timetables can result in unfavorable train connections among different subway lines at transfer stations and generate rather long waiting time for transfer passengers. This paper aims at optimizing the first train originating times of different transit lines at the network scale. The cost function of transfer waiting tim...
Article
Determining the required probe vehicle size for real-time travel time estimation is an important issue in probe-data based applications, such as traffic monitoring on a roadway network. This paper provides an innovative approach for the determination of proper sample sizes with the aid of a simulation model. The model, which was built for El Camino...
Article
Full-text available
Most of the existing studies adopt the fixed-demand equilibrium formulation to model drivers’ route choice when studying network throughput maximization problem. Travelers’ reactions to the increased origin-destination (O-D) travel cost and network congestion level are less considered in the problem. Note that travelers can cancel the trip or use o...
Article
Full-text available
Imagine in the future that autonomous vehicles coordinated and guided by signal-free autonomous intersections are able to pass through the intersections immediately after the vehicles in the conflicting direction leave. Meanwhile, with the coordination of the autonomous intersections, autonomous vehicles on any approaching lane are able to turn ont...
Conference Paper
The ship berthing time is an important indicator to measure the operation efficiency at the port. Characterizing the distribution of the berthing time can quantitatively describe the patterns of ship operations. In this paper, large amounts of data of ship operations at the port are obtained from the automatic identification system (AIS). The data...
Article
Full-text available
Loop detectors distributed on freeways are very vulnerable and could be damaged or malfunctioned due to improper sealing, pavement deterioration. This may lead to poor travel time estimation as most of existing methodologies require detailed data collected from numerous detectors along a specified freeway route. To address this problem, this study...
Article
In order to successfully apply the cooperative adaptive cruise system to transportation, the key precondition is to ensure that the CACC vehicle on road can communicate with other vehicles within certain distance. The road can be discretized into uniform cells with the cellular automation concept. Based on it and the traffic flow theory, probabilit...
Article
Full-text available
Among different stochastic user equilibrium (SUE) traffic assignment models, the Logit-based stochastic user equilibrium (SUE) is extensively investigated by researchers. It is constantly formulated as the low-level problem to describe the drivers’ route choice behavior in bi-level problems such as network design, toll optimization et al. The Probi...
Data
Program source code for numerical example 1. (TXT)
Data
Program source code for numerical example 3. (TXT)
Data
Experimental data for Fig 2 and Tables 2 and 3. (XLSX)
Article
Full-text available
To evaluate the layout adjustment scheme of bus line during subway construction, the method combining quantitative survey and fuzzy aggregation is used. One criterion is transit service level, which considered nonlinear coefficient, line length, transfer distance and average waiting time. Another criterion is traffic impact degree incorporating thr...
Article
In the study of pedestrian movements, a consideration of group behaviors is important because of their potential impacts on pedestrian flow dynamics. In this paper, we investigate the group behaviors during emergency evacuation, which is a critical case for emergency crowd management but has not been fully explored and understood. It has been well...
Conference Paper
The prime objective of this paper was to develop the models of evaluating the passenger transfer time during the urban rail transit transfer with point transfer and channel transfer. The prevailing statistical model of multiple linear regression was applied to construct the relationships between the transfer time and the variables of transfer dista...
Article
At unsignalized crosswalks, interactions between pedestrians and vehicles often lead to traffic safety hazards due to absence of traffic control and unclear right-of-ways. To address this safety problem, there is a need to understand the interaction behaviors of pedestrians and vehicles that are complicated by a variety of traffic and roadway attri...
Article
Full-text available
To investigate the influences of causes of unreliability and bus schedule recovery phenomenon on microscopic segment-level travel time variance, this study adopts Structural Equation Modeling (SEM) to specify, estimate, and measure the theoretical proposed models. The SEM model establishes and verifies hypotheses for interrelationships among travel...
Article
This study presents a new approach for specifying the design of the signalized crosswalk width. Based on the analysis of the characteristics of bi-direction pedestrian flows at the subject signalized crosswalk, a crossing time (CT) estimation model is proposed and developed by taking the time lag of pedestrian platoons as well as bi-direction effec...
Article
Full-text available
In previous evacuation flow planning, a system optimal dynamic traffic assignment (SO-DTA) did not consider the exogenous costs caused by potential traffic accidents. A traffic accident, which might occur as a result of traffic congestion, will impact an evacuation process because of accident-related delays experienced by the downstream vehicles. T...
Article
Full-text available
Signalized crosswalks are considered an important pedestrian facility, where the pedestrian flow possesses unique characteristics. This study used an improved cellular automaton model, which incorporated social forces to describe the interactions between pedestrians, to model the bidirectional pedestrian flow at a crosswalk. The simulation model wa...
Article
It is of great significance to enhance freeway safety. This paper analyze the factors affecting freeway safety systematically. Analytic hierarchy process (AHP) and fuzzy comprehensive evaluation (FCE) were applied to develop a freeway safety evaluation model. This model has a practical application on evaluate freeway safety level.
Conference Paper
This paper studies the modifications of a social force model to simulate the pedestrian corssing by applying the concepts of anisotropy and relative velocity. At the same time, the correcting algorithm is put forward by considering the time complexity of simulation. The parameters for the modified social force model are standardized by researching...
Article
Full-text available
Walking in groups is very common in a realistic walking environment. An extended floor field cellular automaton (CA) model is therefore proposed to describe the walking behavior of pedestrian groups. This model represents the motion of pedestrian groups in a realistic way. The simulation results reveal that the walking behavior of groups has an imp...
Article
Full-text available
Path marginal cost (PMC) is the change in total travel cost for flow on the network that arises when time-dependent path flow changes by 1 unit. Because it is hard to obtain the marginal cost on all the links, the local PMC, considering marginal cost of partial links, is normally calculated to approximate the global PMC. When analyzing the marginal...
Article
In order to analyze conformity in pedestrian's violation crossing behavior, structural characteristics and evolution rules of pedestrian network were studied by using the theory of network. First, some pedestrian violation crossing behavior was observed by the motion capture technology. Second based on the pedestrian's real crossing behavior, pedes...
Article
Full-text available
Three types of different walking behaviors (right preference, conformity, and space priority) are taken into account to model bi-directional pedestrian flow in the channel with cellular-automata formulation. The fundamental diagrams of -pedestrian flow, -pedestrian flow, and -pedestrian flow are obtained from the simulation result to analyze the ef...
Article
To quantitatively evaluate the safety of pedestrian crossing and to quantify the risk degree of traffic conflicts between crossing pedestrian and vehicle at signalized intersection, this paper conducted the risk degree model of crossing pedestrian and vehicle based on the features of pedestrian crossing behavior and the theory of conflict. The SMOK...
Article
In this paper the experiment to study the features of pedestrians' walking preference is designed. Then the cellular automata model which considering pedestrians' walking preference features is built, in which the forward-parameter, right-parameter, surpass-parameter and the correction-parameters are included to mend the probability of the pedestri...
Article
This paper designs the experiment to study the features of pedestrians’ walking preference. Then the cellular automata model considering pedestrians’ walking preference features is built in which the forward-parameter , right-parameter, surpass-parameter and the correction-parameters are brought in to mend the probability of the pedestrian getting...
Article
Full-text available
In order to quantitatively evaluate the rationality of urban road class configuration, function orientation and network structure, analytical model of functional matching degree of expressway, arterial road, secondary trunk road, urban branch road and the whole road network was built according to the separated-stream characteristics of modal split,...

Projects

Project (1)
Project
Intelligent Vehicles & Future Transportation