Bogotá TransMilenio BRT System

Summary

Bogotá's TransMilenio transformed one of the world's most congested cities by replacing a chaotic private bus network with a structured, dedicated-lane BRT system. The safety improvements were the most dramatic: traffic fatalities on converted routes fell 90%, primarily because dedicated lanes eliminated bus-car interactions. The model has been replicated extensively, and subsequent evaluations consistently find large commute time and emissions improvements. TransMilenio is now the reference case for transit reform in developing-country megacities.

Research question

"Can a bus rapid transit system reduce commute times, emissions, and traffic accidents in a major Latin American city?"

Methodology

Result

Positive

Commute times reduced 32% on BRT corridors; traffic fatalities fell 90% on converted routes; CO2/passenger-km reduced 33%; modal share for BRT reached 19%

Evidence strength

Limited

Observational or pre-post design; correlation not necessarily causal.

Replication status

Replicated