Motohiro Takamisawa, of the highway's operator, Nexco, said he believed structural failure was to blame.
"The results of the investigations are crucial to the understanding of how and why this structural failure occurred, " said a council spokesman.
Blade failure was more common than structural failure or fire.
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Early owners paid a price that sometimes included structural failure.
However, what it fails to recognise is that the structural failure of management is embedded in an even wider context, namely how in our society we run our economies and corporations.
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Note: We changed this story on 15th February 2013 to reflect the fact that the accident was caused by structural rather than mechanical failure.
In the end, though, the real commercial victims of the failure of structural reform in Europe are not the region's existing companies, but those that are never born.
It is clear that continuing failure to address structural problems in Europe and Japan worries the IMF.
"Evidence is there that a structural, mechanical or electrical failure of some kind led to the explosion, " Kreindler, who represents the families of 23 of the crash's victims, told the newspaper.
But talk of a pensions crisis only exposes the pact's longstanding failure to distinguish properly between cyclical and structural factors.
The second threat is failure to secure the medium-term structural shifts in fiscal positions, in management of the financial sector and in export-dependency, that are needed if a sustained and healthy global recovery is to occur.
But if so, you should be looking for ways to make structural changes to the news business to address this market failure.
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The biggest criticism of Mr Tremonti has nothing to do with tax cuts, and everything to do with a failure to push through measures to tackle the structural weaknesses of the Italian economy.
Another worry has been Mr Menem's disappointing failure in his second term to maintain the pace of structural change of his first term.
The European Commission has said it is focusing more on "structural" budget deficits which means it won't demand more cuts from governments if their failure to meet budget targets is caused by weaker-than-expected growth.
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