Quote:
Originally Posted by shogged
No I used a highway as an example to show you that speed matters to noise. If you're just going to be pedantic why are you here for the debate?
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Speed does matter to noise, but you're using noise generated at highway speeds to argue that 50 KM/H is too loud for residential areas and claiming the problem will be greatly mitigated by 30 KM/H and that is absurd. At those speeds, you are more likely to hear exhaust/engine noise than tire noise, and at that speed, you're just subjecting yourself to MORE noise by lowering speeds because it takes longer for the vehicle to pass.
I have a link that claims light traffic is about 50dB, but let's take the 'NoNoise.org' link posted above as gospel, and assume that 30 MPH (~50 KMH) produces sound levels about 62dB @ 50 ft. Now that's an unobstructed, standing in a field on a calm day sort of thing. You might be in a house, fenced backyard, and that is all going to reduce the noise you hear. But let's go with standing in the open.
Let's say a car is passing by. You're standing about 35 feet away from the roadway, and the car passes by at 50 KM/H. Sound levels are 62dB at 50 ft means you'll hear the vehicle at 62dB or greater for 71 feet of vehicle travel. At 50 KM/H it takes a vehicle approximately 2 seconds to travel 71 feet.
62dB, by the way, is roughly the sound level of a casual conversation. Are you seriously that bothered by 62dB for 2 seconds?
By the way, that 30 KM/H means that vehicle is going to be within earshot for 3 seconds versus two, and I'd do the math on that but even the 'NoNoise.org' people didn't bother to post the noise levels generated at ~20 MPH because even THEY aren't that anal it would seem.