The traditional idea of driving lanes is more of a suggestion than a hard and fast rule in India. Sidewalks are often a work in progess or packed with merchandise, so the roadway is a better option for pedestrians. Each lane is organically subdivided into micro-lanes, with faster traffic at the far right (India being a left-hand-drive culture), slower vehicles in the road center, and everyone else on the edge.
A two-lane road becomes a six-plus-lane road. In this way, the road section and the public right-of-way remain relatively narrow, leaving more space for homes and shops (micro-retail and maker spaces galore!). The fact that trucks, cars, and most other vehicles are more compact than in the west (with very few gigantic SUV’s) also increase road capacity.
While segregating pedestrians on sidewalks, bicylists in cycle tracks, and cars in driving lanes may makes sense from a transportation level of service viewpoint, there are real physical space and urban vibrancy consequences resulting from this strategy.