Experimental Design Details
Experiment design:
(1) Event theme: Beijing Subway Green Low-Carbon Travel Challenge Month
(2) Event duration:
① A total of 2 months, with weekly cycles;
② After the two-month event, continue to observe passenger behavior for 2-4 months.
(3) Event area: Jinggang Subway Line 4 to Daxing Line (high passenger flow, significant peak-hour tidal flow). Plan to recruit participants from 5 stations: Majiabao, Xingong, Gaomidian North, Gaomidian South, Zao Yuan.
(4) Target travellers:
① Selection criteria:
- After recruitment, extract the user's past 3 weeks of historical data. The user should have used Line 4 for commuting during the early peak period at least 3 times in 1 week, 5 times in 2 weeks, and 7 times in 3 weeks.
- Travelers who do not plan to leave Beijing in the next 2 months.
② Number of participants: Recruit about 450 eligible participants, divided into 4 groups.
③ Recruitment method:
- Promotional materials: designed by Beijing Jiaotong University, including publicity canvas, event public account, registration questionnaire, QR code for registration, and registration link;
- On-site promotion: set up a publicity area in the selected subway station hall/entrance, post a poster or place a roll-up banner, and have staff on-site for promotion and recruitment, avoiding the passenger flow line.
All on-site staff are students from Beijing Jiaotong University, 1-2 students per station, wearing student identification on-site.
(5)Treatment groups
① Control group: Participants receive irrelevant information every week;
② Information feedback group: Participants receive feedback on their travel behaviour from the previous week every week, without any additional monetary reward;
③ Multiple-times self-selection group: During the experiment, participants receive information feedback every week and can choose their own monetary reward mode for the week;
(1)Piece rate: Participants receive a 5 yuan reward for each early peak period travel. They can earn the reward once per day at most. A maximum of three rewards can be obtained per week.
(2)All or nothing: Participants who travel during the early peak period on at least three days in a week can directly receive a reward of 15 yuan;
④ One-time self-selection group: Before the first reward week, participants choose their reward mode for the entire experiment period as either a piece rate or a all or nothing reward. Once chosen, it cannot be changed.