Traffic finally flows across CBI Jn Magic Box

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Written By Photoyogi - 29 October, 2008

Bangalore magic boxes Bellary Road Road Works Citizen Reports Transportation Infrastructure Flyovers and underpasses

Finally The CBI Jn seems to be open to public, Not sure if some lessons have been learnt... There is no tar on the road still! Its got this "super rubble" finish that tests out vehicle road fitness!!!

Or Probably BDA Jn flyover construction taught BBMP that any amount of compression using vibra-rollers are not as good as actual traffic! So now, as the traffic "rolls" over the junction and we already see certain areas showing resemblances to the Moon! Wonder why we should have the Chandrayan just come to CBI Jn! Please wait i will put up some more updates on this. PhotoYogi

COMMENTS


Having a one man show running the lives of 8 million people and growing is proving very costly for bangalore. The sooner we have an elected council in place, the better! Atleast people blogging here can interact with the councillors when approving such road designs.
Let me rephrase what i said improperly. They had the right idea for this strech to make it signal free. They were right only in that thought. I cant say the same about methods used and the implementation. In that I would concur with all your comments on the same.

bad approach to bldg roads

blrsri - 29 October, 2008 - 06:46

We have seen many infra companies doing a very good job in laying roads..including l&T. All it needs is the right approach to lay roads.. one possible explanation for BDA doing this is to open the road for traffic early and reduce congestion! but inturn help the tyre seller cartel! :P btw videos are that much better!

Why a magic box?

asj - 29 October, 2008 - 12:11

Seeing the layout using google maps and sat imagery I just fail to understand why there was a need for a magic box? ASJ

Cost of not having foresight

asj - 30 October, 2008 - 13:42

Basically Bangalore and Pune (plus other cities) are having to pay for lack of foresight. I have attempted to show the difference between highways and city roads in another post and if our civic planners had any clue, they will have ensured no development happens within 30 meters of NH. But they allowed it and with every new development came another junction that crossed the highway. Now their solution to overcome lack of foresight is perhaps affected by the same pathos i.e. lack of foresight. I will now attempt to share what I might have done rather than rely on my memroy of what I may have seen in Sussex 14 years ago!! Lets begin with the basic concept of junction free highways. http://better.pune.googlepages.com/bellarytemplate.jpg As seen above, every few miles, the left lane on either side of the 3 + 3 lane highway becomes an exit and entry point and intervening brown section made part of hard shoulder. Now there is a problem here, the two sides on either side are divorced completely. Typically, the solution is to have flyover connect two sides. This is seen below on a section of M1 motorway in UK http://better.pune.googlepages.com/m1.jpg Note the sat image showing the flyover connecting two sides (station road). Now this could well have been an underpass, but it would have remained completely delinked with the actual highway. Instead, in India, what we are attempting now is to build flyovers after flyovers (now along with these magic boxes) at every junction we have allowed to crop up along the (so called) highway. What may be the solution? The solution is to create what I have in the first image above. To do this in the current circumstances is rather difficult, but ideally, this is what ought to be considered - http://better.pune.googlepages.com/bellarytemplate5.jpg Create entry and exit points as shown above on either side with intervening portion (shown as brown) having only 2 lanes on the highway. This intervening portion will not have any junctions any more. This will need repeating strategically along the highway and between each entry/exit junctions, the highway will become non-accecssible. But what makes the magic boxes even more badly planned is the treatment given to the Bellary road at the junction with CV Ramana road and further downstream at when it meets the ORR. http://better.pune.googlepages.com/bellarytemplate1.jpg With the above already in place what may be done other than magic boxes Its amazing that with two decent free-flow systems in place on either side, the need to overcome junctions at Sanjaynagar and CBI junctions was / is attempted using Magic boxes rather than - http://better.pune.googlepages.com/bellarytemplate4.jpg As seen above, all junctions between the two free-flow systems should be blocked off completely (red lines along the highway). And all traffic made to join the highway only via the free-flow systems on either side. This may be a slight detour, but on the highway the traffic moves without junctions. And as its the latter alone which can be done realistically, the objective is achieved without excess spending. The only reason then for considering a magic box, is to let pedestrians across (and by making ramps rather than steps, it more or less becomes disabled friendly too). Ideally this question will not arise as technically highways should be devoid of all pedestrians, but the circumstances are such that urban growth has been allowed too close to the NH. ASJ

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