system
Given the following post, respond as if you're commenting on Reddit:
human
Why are some roads made from concrete/cement rather than asphalt? What determines whether it should be one or the other? Why do a lot of the cement roads have grooves in them?
gpt
Cement roads are significantly more expensive. Asphalt is the cheaper option and actually has a better safety rating due to more traction. The grooves are used for better road traction or to extend the life of the road surface.