02 September 2009

Quiet Now


The city in which I live - Frederiksberg - is currently repaving the streets. It's an ongoing process but I was interested to learn that the asphalt they're using is specially designed to reduce noise from motorized traffic.

Which is nice but it's also rather important. I've posted about how traffic kills ten times more people than traffic accidents. Built into the number of deaths are pre-mature deaths from heart disease and high blood pressure caused by the noise of the traffic.

The asphalt the city is using has a noise reduction of 5.1 dB, which is a reduction of more than a half.

There is little difference in the asphalt if you look at it. The structure of it, however, is more open which allows the noise to travel downwards into the ground instead of only up into the air.

According to the City of Frederiksberg will all 34 km of roads in the city be paved with noise reduction asphalt when the current asphalt needs to be replaced.

The asphalt lasts for 12-14 years while the noice reduction qualities only lasts roughly six years.

6 comments:

A Midnight Rider said...

It's like everyone is driving a Prius. The silence is deafening.

Frits B said...

The road on which I live has had the same treatment. Very quiet, but for some reason also more slippery when wet or frozen. You obviously can't get everything.

Son of Shaft said...

Reminds me of patches of road on the highways around Rotterdam in the "90s. Dutch Department of traffic and waterworks was experimenting with lots of different formulations to get quieter/safer road surfaces.
So when one drove over the highway and hit a test patch it suddenly got a lot quieter in the car. Problem with zoab is that the openings eventually get clogged up by dirt and grime and reduce the capacity to let water/rain flow away. Then you get ,as Frits said, slippery roads. Last time I heard (still in the 90s)they were still trying to improve on that.

Krakonos said...

How about making the cars go slower to reduce noise? The cars themselves would be more quiet and there would be even more bicycles as 1) the speed advantage of the cars becomes less and 2) cycling and walking becomes safer.

Szymon said...

They add rubber from old schredded tires and that reduces the noise. It also reduces tons of garbage.

Anonymous said...

Hopefully it won't also translate into more accidents involving cyclists who didn't hear the car behind them.