Results of a large-scale randomized behavior change intervention on road safety in Kenya

Road accidents kill 1.3 million people each year, most in the developing world. The authors test the efficacy of evocative messages, delivered on stickers placed inside Kenyan matatus, or minibuses, in reducing road accidents. The authors randomize the intervention, which nudges passengers to complain to their drivers directly, across 12,000 vehicles and find that on average it reduces insurance claims rates of matatus by between one-quarter and one-third and is associated with 140 fewer road accidents per year than predicted. Messages promoting collective action are especially effective, and evocative images are an important motivator. Average maximum speeds and average moving speeds are 1–2 km/h lower in vehicles assigned to treatment. The authors cannot reject the null hypothesis of no placebo effect. They were unable to discern any impact of a complementary radio campaign on insurance claims. Finally, the sticker intervention is inexpensive: the authors estimate the cost-effectiveness of the most impactful stickers to be between $10 and $45 per disability-adjusted life-year saved.


  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01576672
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 21 2015 9:49AM