To expedite the process and make it more cost effective, Delhi Metro Rail Corporation (DMRC) is making use of gigantic 25 metre-long girders to join spans on elevated stretch of the section.

‘‘The cost of construction with the existing 3-meter spans works out to Rs 24 crore per km, while the 25-meter ones cost Rs 19 crore per km. So using the bigger spans will result in a saving of nearly Rs 5 crore per km,’’ said a DMRC official.

It  looks like this..

The bigger spans work out to be more economical and also speed up pace of the construction. Officials said it takes about a week to join the space between two pillars using segmental construction while the bigger spans can be put in place in just one day.

The metro work is underway on main roads in most part of Bangalore. The metro stations that are to be constructed are significantly wider than the main track. Will this not create bottlenecks on adjacent roads? For example, there is a metro station being constructed on Old Madras Road near the 80ft road junction. The Old Madras road which is wider on either side of the station suddenly becomes very narrow leading to frequent traffic jams here. Even after the construction of the station, the road width isn't going to change and this can be a serious problem later on. 

Consider the Vijaynagar main road. If the Metro station is constructed near the Bunts Sangha, it will almost be as wide as the road today. How can  the width of the roads be made uniform throughout?

Is this something that BMRCL is thinking of? In addition, the presence of a station will require rickshaw stands and bus stops nearby which means the roads have to be wider in these places. On the contrary, the station makes the road narrower. This is definitely a double whammy. 

This report in DH states that the Scomi Engineering /Geodesic Techiques tie up is pitching for Bangalore Monorail on BOT basis (build, own, transfer), whose first phase of execution will see $2.4 billion investment.