India, Oct. 6 -- Imagine driving through a capital city during rush hour without seeing any green or red lights. No automated stop signals or electronic poles controlling the roads. Sounds like a recipe for congestion, right? Think again. Also read | Bhutan travel: How to visit the Land of Happiness on a budget

Welcome to Thimphu, Bhutan's capital and the only capital city in the world with no electronic traffic lights. While Vatican City, the world's smallest state, also has none inside its walls, Thimphu is the only functioning capital to manage traffic entirely without them.

Instead of mechanised signals, traffic in Bhutan moves under the direction of human police officers. Standing inside ornate, traditionally decorated wooden booth...