Sri Lanka has been ranked the third most traffic-congested country in the world, highlighting the region's continuing struggle with worsening road gridlocks.

According to Numbeo's Traffic Index by Country 2026 Mid-Year, Sri Lanka recorded a traffic index score of 254.5, placing the country only behind Nigeria and Costa Rica.

Bangladesh, Kenya, Egypt, Peru, Iran, India and Colombia rounded out the top 10 most congested countries in the world.

Nigeria recorded the world's highest traffic index at 320.3.

Numbeo compiles its Traffic Index using data submitted by users to compare congestion levels across countries and cities. The index measures the overall level of traffic congestion experienced by commuters by evaluating average travel time, traffic inefficiencies, estimated fuel consumption and carbon dioxide emissions. Higher overall scores indicate more severe congestion.

The scoring system relies on several specific sub-indices to break down the commuter experience. The Time Index reflects the average one-way daily commute in minutes, providing a baseline for how long it typically takes to travel within a given city.

Building on this, the Time Expenditure Index estimates commuter dissatisfaction. This metric is based on the assumption that frustration increases exponentially once a one-way commute exceeds 25 minutes.

Additionally, the Inefficiency Index assesses how effectively a city's transport system functions. Higher scores in this category generally point to a greater reliance on private vehicles, limited use of public transportation, or excessively long commutes.

Finally, the CO2 Emission Index estimates the amount of carbon dioxide produced by a passenger's daily round-trip commute, measured in grams. The estimated emissions for a single one-way trip can be calculated by dividing this round-trip figure in half, according to the ranking by Serbian crowd-sourced online database of perceived consumer prices, real property prices, and quality of life metrics.