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1

Antivehicular ones. But also anti pedestrian, The goal is to keep pedestrians and people, bikers, etc off this section. Namely because if it should be in proximity to moving vehicles.


2

It depends on the type of the joint: The smooth dowel is used in an "expansion/contraction joint" to allow for free (lateral) movement due to thermal expansion/contraction of the concrete on either side of the joint. A smooth dowel has less surface for bonding, and no rib (small deformation around the bar) to restrict the movement. Sometimes ...


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