Evaluating the Impact of Road Safety Initiatives in Liberia

Last registered on March 15, 2022


Trial Information

General Information

Evaluating the Impact of Road Safety Initiatives in Liberia
Initial registration date
March 11, 2022

Initial registration date is when the trial was registered.

It corresponds to when the registration was submitted to the Registry to be reviewed for publication.

First published
March 15, 2022, 8:03 PM EDT

First published corresponds to when the trial was first made public on the Registry after being reviewed.



Primary Investigator

Sciences Po

Other Primary Investigator(s)

PI Affiliation
Development Impact Evaluation, World Bank

Additional Trial Information

In development
Start date
End date
Secondary IDs
Prior work
This trial does not extend or rely on any prior RCTs.
The goal of the study is to understand drivers' risk-taking behavior and how they form their beliefs about the risk of accidents. Taxi-drivers in Liberia will be recruited to participate in a lab-in-the-field experiment. As they join the experiment, drivers will be randomly assigned to one of the following groups: control group, road safety training, business training. Before and after their training (or consecutively for the control group), drivers will complete surveys and complete games that will allow the research team to estimate their beliefs and behavioral measures.
External Link(s)

Registration Citation

Bougna, Theophile and Golvine de Rochambeau. 2022. "Evaluating the Impact of Road Safety Initiatives in Liberia." AEA RCT Registry. March 15. https://doi.org/10.1257/rct.9073-1.0
Experimental Details


The intervention has two treatment arms:
- Road safety training: training designed to teach participants behavior to prevent accidents. The training contains four sections: vehicle road worthiness (inspection of vehicles, break lights, maintenance of vehicles), traffic signs, risk factors for roads traffic injuries, magnitude and health impact of road traffic injuries in Liberia.
- Business training: this training is designed to teach drivers how adopting safe driving behavior can be reconciled with increasing their profits. The training contains two sections: taxi economics (how to calculate profits and losses from safer behavior), entrepreneurship (how can I modify my business model to improve profits).
Intervention Start Date
Intervention End Date

Primary Outcomes

Primary Outcomes (end points)
Incentivized beliefs about the risk of accidents, incentivized beliefs about the impact of drivers behavior on the risk of accidents, self-reported measures of locus of control, self-reported measure of risk-taking behavior, self-reported measures of overall driving ability and relative driving ability, incentivized measure of attention to road safety data, self reported measure of optimism, (medical) insurance interest and take-up.
Primary Outcomes (explanation)

Secondary Outcomes

Secondary Outcomes (end points)
Secondary Outcomes (explanation)

Experimental Design

Experimental Design
Taxi drivers will be recruited in transport hubs in Monrovia, Liberia's capital and invited to join the experiment. Enumerators will approach taxi drivers via driver unions to participate in the lab-in-the-field on a given day and time of day (morning or afternoon). Enumerators will also say to drivers that the interview can take up to half a day, that they will be compensated for their time. Drivers will also be told that the voucher is for them and cannot be transferred to another person. All taxi-drivers operating on the highways (operating on a rout from Monrovia to another city) are eligible to participate. Recruitment will start with taxi-drivers (cars). However, if this does not allow us to reach the targeted sample-size we will consider recruiting drivers of mini-buses and/or motorcycles. The lab-in-the-field experiment will take place in an experiment center, that is close to where the taxi-drivers are being recruited and has three different rooms, each for every treatment group. We target a sample size of 300 participants. Training sessions will be group sessions of 10 drivers, and we will have two sessions per day (morning and afternoon). Participants will have to complete a survey before and after the training session (or consecutively if they are in the control group). Two weeks after the lab-in-the-field, a phone follow-up survey of the 300 participants will take place.
Experimental Design Details
Randomization Method
Upon their arrival in the experimental center, participants randomly draw a folded paper with their group assignment. There are exactly 10 papers for each treatment group, in each training sessions (10 sessions in total).
Randomization Unit
Individual randomization
Was the treatment clustered?

Experiment Characteristics

Sample size: planned number of clusters
300 participants
Sample size: planned number of observations
300 participants (observed in panel, 3 waves of survey)
Sample size (or number of clusters) by treatment arms
300 participants
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)

Institutional Review Boards (IRBs)

IRB Name
Sciences Po CDR
IRB Approval Date
IRB Approval Number
IRB Name
University of Liberia PIRE IRB
IRB Approval Date
IRB Approval Number
Analysis Plan

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Post Trial Information

Study Withdrawal

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Is the intervention completed?
Data Collection Complete
Data Publication

Data Publication

Is public data available?

Program Files

Program Files
Reports, Papers & Other Materials

Relevant Paper(s)

Reports & Other Materials