Typically it's the main roads that have traffic jam. Neighborhood roads are open, so the dark store has to be close enough to the customers. It could be done, but would be expensive.

During peak commute hours, all the traffic from main roads spills over into the side streets. Case in point - my parents have an independent house, but the road on which it's situated, has become a so called "short-cut". So when the main road gets congested, people take the "short-cut" to shave time. I can see this work in the newly planned areas..

Haha, visit Mumbai once

Exactly!