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Because if they built them in one big slab, the heat from the sun would cause expansion which would start cracks. This seam gives any cracking a place to be without bothering anything, and also means that any cracks that do start will be contained to one block.

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Q: Why are sidewalks built with spaces in between?
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to stop it from flooding


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it expends and etract and then the sidewalk formes cracks, concrete has cracks so when it is hot it can expand.Actually the 'spaces' aren't really spaces, they just look like it. They are there so that when the concrete cracks (and it will, due to Why_are_sidewalks_built_with_spaces_between_each_sectionfluctuations, ground imperfections, and traffic), the cracks will largely be restricted to the 'spaces'. This is so that the cracks are mostly unseen and so that people are less likely to trip on the cracks.


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