I saw this image in the WhatIsIt subreddit, where readers were asked to provide an explanation for their intended function. I thought perhaps they were for stringing communication etc cables across the river and was delighted to read this postulated explanation, which rendered the image blogworthy:
"To plant explosives. In some countries bridges are designed to be easily blown up in case of war. Don't know if this is the case."
It wasn't long before the true explanation was provided, which I'll put "below the fold" so you can ponder for a moment...
"I’m not immediately familiar with that particular style of bridge, but when they form and pour the concrete bridge columns…. They leave through sections like this that will support the form work for the bridge deck through those slots. Once the reinforcing steel is placed and the concrete deck poured, it will support itself and then they remove the support forms and are left with the slots."
So it's a structural engineering technique; several photos have been added at the reddit post to illustrate the answer.
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