And also, how do they hold up so well? I’ve noticed a new trend where all the cement roads have this and they cut down noise *and* seem to last longer.
In: Engineering
The lines have nothing to do with noise reduction. Concrete is much smoother than asphalt. That makes untextured cement fairly slippery so they cut lines into it to improve its traction.
What’s causing the noise reduction is just the cement itself. Concrete absorbs much more noise than asphalt does, which makes it a quieter material for roads. In general, textured concrete is just a better material to make roads out of, its just much more expensive than asphalt so it isn’t used as much.
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