AndrewJin
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Not really the case in modern metro constructionWherever the density of buildings is high, the metro is underground, else it is overground. Plus, the cost of overground is cheaper.
They want to start building underground tunnels for road transport.
Bangalore
http://www.news18.com/news/india/rs...l-project-to-decongest-bengaluru-1388299.html
The proposed project of four tunnels would be from Hebbal to Chalukya Circle (6 km), Jalahalli to Goraguntepalya (1.4 km), SRS Road and Pipeline Road, Peenya (2.25 km), and Nayandahalli to Majestic (8 km).
Mumbai
http://www.hindustantimes.com/mumba...sgnp-tunnel/story-WlUPv2HV9EsQKBdGxhO12O.html
Soon, Mumbai residents will be able to travel between Borivli and Thane in 10 minutes owing to an 11-km underground tunnel passing through the Sanjay Gandhi National Park (SGNP).
Delhi
http://www.hindustantimes.com/delhi...lhi-traffic/story-SS0TszIohwzB0SkpMtWchK.html
7 tunnels planned at key spots to ease Delhi traffic
So we can have cars going underground and metro going overground.
There's another reason. The Metros can be connected to other feeder services and are also overground, like monorail.
And pod taxis.
http://www.livemint.com/Politics/jT...d-car-pilot-project-in-India-at-own-cost.html
http://www.livemint.com/Politics/vk...ng-Rajasthan-and-Maharashtra-line-up-for.html
At least six states are in talks with companies that build personal rapid transport systems (PRTs) to operate pod taxis, futuristic driverless vehicles that ply along a pre-determined course, a central government official said.
With overground metro stations, you can have pod taxis directly entering and leaving the stations at the same level. If the metro is underground, then it becomes a pain in the a** for passengers to move from underground to overground.
And many overground trains have just 4 cars, that's really short-sighted plan.