Coast Road diary

18.01.2015

Today I spent time trying to understand what will be the capacity to transport of the coast road project.The 128 odd km train network transports 7 million people everyday. 4000 BEST buses running on whatever number of route kms transport 4 million people. Similarly the 36km coast road, how many people will it transport?

For example if the project is 36 kms long and has four lanes and if each lane is 3.5 meters wide then we have a conveyor belt whose total area will be

For one kilometer

1000 meters into 14 meters = 14000 sq.mtrs.

For 36kms

14000 x 36kms = 504000 sq mtrs.

Now if each car(to begin with only cars) is occupying 25 sq. mtrs of space then we can have 504000/25 = 20160 cars on this conveyor belt – two lanes are for south and two for north.

Now if these lanes are moving at a consistent speed of 50kmph then how many vehicles pass through in an hour? How many people (depending on vehicle type, single person driving a car or a bus full of people) would be transported in an hour? How many in a day.

I checked the coast road report and realised that the dimensions of the road are much more

Widths of coast road

We will see a total road width of 36ms so the above calculation changes to

1000 x 36 = 36000 sq. mtrs.

For 36 kms

36000 x 36 = 1296000 sq mtrs area

And 1296000/25 = 51840 cars

Subsequently I decided to check up on google and found this useful document – technical paper from Transport for London on the same subject. Though the document has not given the answer it has all the correct formulae and principles to be followed. Now hopefully I will be able to with the assistance of more trained people be able to ascertain how many people will be able to flow in the peak directions on the coast road.

My concern is that as per the coast road they are providing 18 meters of road in each direction which is 60 feet wide. I do not see any road along the west coast which is 60 feet wide – one side? Everybody moving on the coast road has to join the mainland sometime and when four lanes converge into less than two lanes like in Bandra and Juhu and Andheri then will that not lead to traffic backing up on the coast road? Leading to traffic jams transferring from the internal city roads to the coast road?

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