For years, the roads of Mumbai were a hotbed of congestion and overcrowding. Now, a dynamic link road promises to ease the city’s traffic woes. But the construction of Mumbai’s first double-tiered flyover has been anything but easy, with resettlement and land acquisition proving a logistic nightmare. Yet a thousand years ago, the Khmer rulers of Cambodia moved a nation with a complex network of roads and rivers that linked their empire across four countries.