Why do sidewalks have blocks, instead of being solid?

Question

Why do sidewalks have blocks, instead of being solid?

In: 205

Answer 1

Like concrete? They are not typically poured as separate blocks. They are joints, tooled or cut purposely as weak spots that will encourage cracks at that joint instead of random spots. If concrete is poured next to existing concrete or asphalt, they will install expansion joints between the new slab and existing medium which is separate.