Testing nudges to collect traffic and parking fines
Last registered on January 09, 2018

Pre-Trial

Trial Information
General Information
Title
Testing nudges to collect traffic and parking fines
RCT ID
AEARCTR-0002611
Initial registration date
January 07, 2018
Last updated
January 09, 2018 6:04 PM EST
Location(s)
Region
Primary Investigator
Affiliation
Australian National University
Other Primary Investigator(s)
Additional Trial Information
Status
On going
Start date
2017-10-16
End date
2018-02-28
Secondary IDs
Abstract
In July 2016, the estimated value of uncollected traffic and parking infringements in the Australian Capital Territory (ACT) was approximately $33 million. The aim of this trial is to test the effectiveness of letters on the collection of traffic and parking fines. The trial focuses on debt cases that are more than six months old. Two treatment letters are being tested. The first letter addresses social norms. The second letter highlights that unpaid fines do not go away. The control group does not receive a letter.
External Link(s)
Registration Citation
Citation
Sinning, Mathias. 2018. "Testing nudges to collect traffic and parking fines." AEA RCT Registry. January 09. https://www.socialscienceregistry.org/trials/2611/history/24825
Experimental Details
Interventions
Intervention(s)
Two treatment letters are being tested. The first letter addresses social norms. The second letter highlights that unpaid fines do not go away. The control group does not receive a letter.
Intervention Start Date
2017-10-25
Intervention End Date
2017-12-22
Primary Outcomes
Primary Outcomes (end points)
Amount paid, payment in full (yes/no), payment plan entered (yes/no), fine successfully withdrawn (yes/no), fine transferred to another driver (yes/no), case closed for other reason (yes/no), number of days until payment after letter was sent, number of days until payment plan entered after letter was sent.
Primary Outcomes (explanation)
Secondary Outcomes
Secondary Outcomes (end points)
Secondary Outcomes (explanation)
Experimental Design
Experimental Design
The aim of this trial is to test the effectiveness of letters on the collection of traffic and parking fines. The trial focuses on debt cases that are more than six months old. Two treatment letters are being tested. The first letter addresses social norms. The second letter highlights that unpaid fines do not go away. The control group does not receive a letter.
Experimental Design Details
Randomization Method
Randomization in Stata using a random seed. The Stata command randtreat v1.4 (5 April 2017) was used for stratification.
Randomization Unit
Randomization at the individual level; no clustering.
Was the treatment clustered?
No
Experiment Characteristics
Sample size: planned number of clusters
10,702 individuals.
Sample size: planned number of observations
10,702 individuals.
Sample size (or number of clusters) by treatment arms
Treatment group 1: 986 individuals, Treatment group 2: 972 individuals, Control group: 8,744 individuals.
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
IRB
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Name
Human Research Ethics Committee, Australian National University
IRB Approval Date
2017-10-24
IRB Approval Number
2017/783
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 and Papers
Preliminary Reports
Relevant Papers