ferny
Club Retro Rides Member
Posts: 984
Club RR Member Number: 13
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Noisy vehicle camera's ferny
@ferny
Club Retro Rides Member 13
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BBC News - 'Acoustic cameras' tested in bid to cut noisy vehicles www.bbc.co.uk/news/uk-48564995Interesting idea. They seem to focus on motorbikes, but I'm not fully clear on what the regulations are at the moment or how older cars come into it. Surely your vehicle only needs to conform to what was in law when it was produced? Edit - Just found this; Cars and Noise The external noise emitted by passenger cars has been controlled since 1929 when the Motor Cars (Excessive Noise) regulations were introduced. New cars are now required to meet Europe-wide noise limits. These have been progressively reduced from 82 decibels (dB (A)) in 1978 to the current limit of 74 dB (A) established in 2016. Information on the level of noise recorded for new models of cars at their type approval test is also listed in the data table available to download here carfueldata.vehicle-certification-agency.gov.uk/downloads/default.aspx. When looking at this information please note that off-road vehicles are allowed to be 1dB (A) louder and wheelchair accessible vehicles or armoured vehicles are allowed to be 2 dB (A) louder. The noise levels quoted above are the maximum levels that are permitted for new vehicle types. Many vehicles produce lower levels of noise, and it is illegal to modify the exhaust system of a vehicle to make it noisier than the level recorded for that model at type approval. A new EU regulation was introduced from July 2016, Regulation (EU) No 540/2014, phases in tighter noise limits over 10 years, together with a revised, more representative test procedure. By 2026 the limit for most new passenger cars will be 68 dB(A). www.vehicle-certification-agency.gov.uk/fcb/cars-and-noise.asp |
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Last Edit: Jun 8, 2019 12:37:24 GMT by ferny
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Hi, I'm doubtful. How is it going to know which car is making the noise? It will have to be fixed camera to get the reg number so it couldn't track the car as it went past to further decide. It could be the one in front, behind or next to it. It could even be a quiet car with the windows open and the sound system cranked up. Would a dump valve trigger it?
Far too many variables.
Colin
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Last Edit: Jun 8, 2019 13:03:06 GMT by colnerov
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I've no idea how these are supposed to work so I can't comment on the technical aspect of this.
But
Most cars that are louder than average are either modified or knackered, so I wouldn't be surprised if fines issued by these cameras/noise detectors (whatever they're called) will be followed up with orders to get your vehicle inspected.
The difference between these and speed cameras is, drivers know what speed they should be driving an can see easily if they're breaking the limit. On the other hand how many of us know what a decibel is or how to tell if we're making too many of them? I do know noise is part of the BIVA/IVA regs so anyone who has been through that will know what the maximum volume sounds like. Those of you who do track days and the like have to have your car's exhaust noise measured too, right?
I'm not surprised that this is being targeted at bikes (and scooters!) as these are the most common source of excess and antisocial noise in the town centres and housing estates, though the worst culprits are all illegal riders anyway (lost count of the number of bikes Iv'e seen lately with covered up plates or non at all) so wouldn't be caught by an automated system.
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Save on tech and just fine all Harley owners. [/coat]  |
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no way can they measure sound,you need a decible meter right behind the car at race days, and its tested at a certain rpm to ensure compliance,loads of variables on this,to many to list in fact,plus there is no mot legislation about noise limits other than excessive noise?
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stealthstylz
Club Retro Rides Member
Posts: 14,840
Club RR Member Number: 174
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Noisy vehicle camera's stealthstylz
@stealthstylz
Club Retro Rides Member 174
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From the MOT manual:-
Exhaust noise from the vehicle must not be unreasonably above the noise level you'd expect from a similar vehicle with a standard silencer in average condition.
Defect
Exhaust noise levels in excess of those permitted
Category - Major
Always been in there as far as I'm aware. Another thing that we can "get away with" until the powers that be notice, which it seems they have.
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Road vehicle noise is measured to a specific test, it used to be ece r41 and is now R51 which has been around since 1980, basically you accelerate in second gear between two markers something like 100m appart and a sound meter is placed perpendicular to the direction of travel something like 10m away,(can't remember the dimensions but they are defined). The test area has to be open with no risk of sound reflecting back.
I don't know how they plan to replicate this at the roadside, in the real world virtually all cars will exceed the limits when driven in other ways.
I Guess they could apply some very high limit to catch the worse offeners, but how long before every london borough see this as another revenue stream!
I also wonder how the MOT tester is supposed to assess a modified car, most are one offs so not much to compare with!
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MaxN
Part of things
Posts: 482
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There are standards for static and moving noise tests on circuits, on most track days you have to pass a static test whereby a sound meter is positioned about 18 inches from the exhaust at about 45degrees and the revs raised to 2/3rd of maximum. Additionally there is usually a test point on the straight with another sound meter setup about 60ft from the racing line.
If you fail the static test you will not be allowed on the track, if you fail the driver-by you will be black flagged and requested to fix It (usually fix your driving and back off for the test).
I have no real problem with sound meters being setup to measure road noise, but busy traffic may make identification of individuals tough. I also have no issue with sound checks similar to track days either. Maybe my judgement is a tad clouded, there are three cars on my street that are way beyond 'unnecessarily loud' and deeply into the 'obnoxious' descriptor. Their owners seem to come and go at all hours of the night too. Of the three cars the Polo is easily the noisiest, with the Nissan and the Subaru taking runner-up spots.
We also have a guy with a massive sound system in his car but at least he turns it down when he arrives home after about 10PM.
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Jun 10, 2019 11:47:05 GMT
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The one point they don't mention is how are they going to tell which vehicle is making the noise the noise comes from multiple sources on the vehicle so there is no one single source to pin point and multiple vehicles will always make more noise than 1 even if they are standard vehicles, bikes in particular often travel in fairly close groups.
In built up areas at 30mph most of it is down to how you drive anyway, even modified cars and bikes are fairly quiet if the RPM is kept low.
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