Most bridges here do, and often when one needs to be demolished and rebuilt, the military blows it up just for practice.
Edit: Source for the sceptics
The deep demolition, which became a central element in Finnish post-war demolition tactics, and especially the development of readiness to counter surprise attacks that emerged as a threat scenario in the 1960s, received significant support immediately after the wars. The decision concerning structural demolition preparations for bridges was made on January 15, 1946. These preparations meant building charge wells, charge chambers, charge pipes, and charge hooks. Authorities responsible for constructing bridges were required to include the aforementioned structures in their plans, which significantly improved the readiness to destroy the bridges.
If it was not possible to place the charge space inside the abutment or pier, charge hooks could be embedded in the supports during the casting phase, to which the charges could then be attached.
But usually exposed rebar is considerd a fault because it can lead to corrosion and failure of the building.
And you would cut the rebar to length before pouring the beton.
I should’ve thought so as well but unless you can come up with better reasoning or source for these being for bombs, I still find it more probable. I’m not saying it’s a good explanation, but it’s more probable to me.
Anything I found was discussing “charge pits” and I can’t imagine any explosive you’d want to hang on the outside of what you’re demolishing with that sort of frequency.
I’m not saying it’s not true, but I’m not convinced.