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
https://canada.constructconnect.com/dcn/news/technology/2015/03/next-generation-concrete-surface-promises-quieter-roads-1006017w
>”In order to get the quietest pavement possible, you first have to develop the smoothest pavement, and the planes on the NGCS are perfectly smooth,” says Kraemer.
>”The grooves were an afterthought, although they help with friction and directional stability if they’re aligned with traffic. With a squared off groove, a tire will typically settle one tenth of an inch into the groove. The grooves also provide channelization for moisture.”
The smoothness of the concrete is what reduces noise. The grooves are cut to help tires grip the road and also avoid water accumulation which can lead to hydroplaning
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