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Incentivizing citizens’ environmentally-friendly mobility behavior – a field experiment in Austria
Last registered on March 02, 2020

Pre-Trial

Trial Information
General Information
Title
Incentivizing citizens’ environmentally-friendly mobility behavior – a field experiment in Austria
RCT ID
AEARCTR-0005495
Initial registration date
February 25, 2020
Last updated
March 02, 2020 3:44 PM EST
Location(s)
Region
Primary Investigator
Affiliation
Vienna University of Economics and Business
Other Primary Investigator(s)
PI Affiliation
Institute for Advanced Studies
Additional Trial Information
Status
In development
Start date
2020-02-26
End date
2020-10-31
Secondary IDs
CASE_002_2020_IA
Abstract
In this study, we implement a field experiment to test the effects of a mobile app that rewards sustainable mobility choices of citizens in Vienna. The app automatically tracks transport choices and rewards the choice not to take a car with free entry tickets to local cultural institutions. The app visualizes the modal split of each participant and gives feedback on general CO2 emission reduction.
The modal split of Vienna citizens has overall improved over time, yet as of 2018 the three categories forming sustainable transport methods (Walking, Cycling, Public Transport) make up 71% (Wiener Linien, 2019). Through STEP 2025 the City targets several areas of improvement, such as efficient resource usage and availability of reliable mobility modes without a necessity to own a personal means of transport.
The choice of a transport mode has many variables including comfort, availability, cost, speed and perception. By combining sustainable mobility choices with cultural offers as incentives we intend to combine the willingness of fields outside of mobility to contribute with incentives towards a more sustainable city. Daily, citizens make several decisions on their choice of transport mode. This intervention aims to introduce new variables into this choice, by visualizing and emphasizing a collective goal through individual actions. Instead of subsidizing transport choices directly and monetarily, we test the interaction of non-related incentives (cultural offers) and visualization of choices (CO2 emission reduction) with sustainable mobility.
External Link(s)
Registration Citation
Citation
Grosch, Kerstin and Jakob Hackel. 2020. "Incentivizing citizens’ environmentally-friendly mobility behavior – a field experiment in Austria." AEA RCT Registry. March 02. https://doi.org/10.1257/rct.5495-1.0.
Sponsors & Partners

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Experimental Details
Interventions
Intervention(s)
Intervention Start Date
2020-02-26
Intervention End Date
2020-08-31
Primary Outcomes
Primary Outcomes (end points)
Outcome variable: modal split of all days with mobility reports
Modal split is defined as: 1 - (distance traveled by car / sum of distance {walking, bike, public transport, car})

Primary Outcomes (explanation)
Modal Split ranges from 0 (100% car usage) to 1 (0% car usage)
Secondary Outcomes
Secondary Outcomes (end points)
Secondary Outcomes (explanation)
Experimental Design
Experimental Design
During this experiment, mobile apps will track mobility behavior of users.
The choice of a transport mode has many variables including comfort, availability, cost, speed and perception. By combining sustainable mobility choices with cultural offers as incentives we intend to combine the willingness of fields outside of mobility to contribute with incentives towards a more sustainable city.
Experimental Design Details
Randomization Method
Randomization with SPSS random number generation in office, with fellow researchers present.
Lowest 300 numbers Control, 301-600 T1, 601-900 T2
Randomization Unit
Randomized on individual level for all treatments
Was the treatment clustered?
No
Experiment Characteristics
Sample size: planned number of clusters
No clusters - 900 subjects
Sample size: planned number of observations
900
Sample size (or number of clusters) by treatment arms
300 control, 300 treatment 1, 300 treatment 2
equal distribution
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
IRB
INSTITUTIONAL REVIEW BOARDS (IRBs)
Analysis Plan

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Post-Trial
Post Trial Information
Study Withdrawal
Intervention
Is the intervention completed?
No
Is data collection complete?
Data Publication
Data Publication
Is public data available?
No
Program Files
Program Files
Reports, Papers & Other Materials
Relevant Paper(s)
REPORTS & OTHER MATERIALS