Why do sidewalks have blocks, instead of being solid?
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Most sidewalks are concrete, a material made by casting it in molds. This causes it to be done in sections, because you generally don’t have a single model large enough to fill the full length of the sidewalk at once or a big enough truck to make it all one big block.
This also gives the advantage that you can leave a little gap between segments, called an expansion joint, that allows the different segments to settle, expand and contract separately.
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