||The Characteristics of Bicycle Behaviour in Cyclist-Pedestrian Mixed Flow on Shared Paths: A Case Study of Hamasen Railway Cultural Park
||Department of Urban Planning
pedestrians and cyclists mixed traffic
The aim of this paper is to investigate the kinematic features and to model the interaction between cyclists and pedestrians on shared paths. Walking and cycling are linked to sustainable transport because both pedestrians and cyclists are non-motorized road users who contribute to healthy, low-carbon lifestyles. To encourage these two traffic modes, it is common to construct shared paths to provide safer environments that protect non-motorized users from general traffic. Although a shared space might be more efficient in terms of saving money and space, it can cause conflicts between cyclists and pedestrians. Hence, it is critical to understand the interaction between bicycles and pedestrians in order to design safe shared paths, particularly from a kinematics perspective.
The data for this analysis were collected with a novel approach using aerial videography. Hamasen Railway Cultural Park in Kaohsiung City, Taiwan was chosen as the survey site. All road users’ trajectories as well as their interaction could be observed and then extracted with a semi-automatic trajectory extraction system to establish the database. The basic kinematic parameters of each object, such as locations, speeds, steering angles, accelerations and decelerations, were stored in a database for further analysis. Some macroscopic and microscopic mixed traffic characteristics were investigated and reported, such as speed differences, lateral distances, longitudinal distances and time-to-collision of cyclist-pedestrian mixed flow. To depict cyclist overtaking behaviour, models based on a discrete choice model were also established.
This paper introduces a new method for cyclist-pedestrian mixed flow surveys. The results also contribute information for urban design, infrastructure management and policy implementation of shared path plans to encourage a non-motorized, eco-friendly traffic mode. In addition, the information obtained is of great help to the calibration of microscopic models and simulation software describing pedestrian and bicycle movements for further application both in academia and in practice.
1. INTRODUCTION 1
1.1. Background and motivation 1
1.2. Research objectives 2
1.3. Structure of the study 3
2. LITERATURE REVIEW 5
2.1. Design of bicycle riding space 5
2.1.1. Bicycle lanes 5
2.1.2. Shared paths 5
2.1.3. Mixed traffic lanes 6
2.1.4. Summary 7
2.2. Traffic flow models 7
2.2.1. Macroscopic model 7
2.2.2. Microscopic model 8
2.2.3. Summary 11
3. METHODOLOGY 12
3.1. Data collection 12
3.1.1. Times and sites of the data survey 12
3.1.2. Procedure of aerial photography and post-production 13
3.1.3. Trajectory extraction technique 15
3.2. Analysis 17
3.2.1. Definition of bicycle behaviour 17
3.2.2. Analysis procedure 18
3.3. Discrete Choice Model 19
3.3.1. Multinomial Logit Model 20
3.3.2. Nested Logit Model 21
4. CHARACTERISTICS OF CYCLIST-PEDESTRIAN MIXED FLOW 22
4.1. Speed 22
4.2. Acceleration/ Deceleration 24
4.3. Lateral distance 26
4.4. Longitudinal distance 28
4.5. Time to collision 29
5. LOGIT MODELLING 30
5.1. Direction Choice Model 30
5.1.1. Parameters and alternatives 30
5.1.2. Model calibration 32
5.2. Cyclist Overtaking model 33
5.2.1. Parameters and alternatives 33
5.2.2. MNL Model calibration 35
5.2.3. NL Model calibration 36
5.3. Simulation 38
5.4. Summary 39
6. CONCLUSIONS 40
7. DISCUSSION AND FUTURE WORKS 42
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