Why are telephone wires strung with a sage in between poles?

Telephone wires are strung with a sag between poles to ensure that they can withstand environmental factors such as wind, temperature changes, and ice accumulation. This sag allows for some flexibility, preventing the wires from becoming too taut, which could lead to breakage or damage. Additionally, the sag helps maintain the proper clearance from the ground and surrounding objects, ensuring safety and functionality.