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> the noise from cars is mostly friction and turbulence Agreed. I can't even hear the engine in my car on the highway over tire and wind noise.
by bmitc 3y ago
> the noise from cars is mostly friction and turbulence
Agreed. I can't even hear the engine in my car on the highway over tire and wind noise.
- kwhitefoot 3y agoPeople on the outside can hear it though.
- bmitc 3y agoI don't think they can unless the car is not moving. The point is: the dominating sound pollution from a car is from sources that are not removed in EVs.
- jayd16 3y ago> not moving You mean like at a stop light or even a stop sign? A very common thing to be near in a city?
- bmitc 3y agoYou mean when other cars are still moving? And what is your point, in general? Engines make noise. That's not under dispute.
- jayd16 3y agoUnless you're on the far corner, you're only living by one side of the road. Hearing ICE engines rev up to accelerate from a light is a non-trivial amount of noise.
- brewdad 3y agoEV “engines” don’t. Way to miss the point.
- bmitc 3y agoAnd the overall point has been that is literally in the noise.
- adrianN 3y agoEVs are significantly less noisy on residential streets though. You know, where people live.
- somerandomqaguy 3y agoOnly below 18mph or 30kph. > As required by the PSEA, (1) this rule proposes to establish FMVSS No.141, Minimum Sound Requirements for Hybrid and Electric Vehicles, which would require [quiet vehicles] to produce sounds meeting the requirements of this standard. This proposed standard applies to EVs and to those HVs that are capable of propulsion in any forward or reverse gear without the vehicle's ICE operating. The PSEA requires NHTSA to establish performance requirements for an alert sound that is recognizable as motor vehicle in operation that allows blind and other pedestrians to reasonably detect a nearby EV or HV operating below the crossover speed. The crossover speed is the speed at which tire noise, wind noise, and other factors eliminate the need for a separate alert sound. >[...] > This standard will ensure that blind, visually-impaired, and other pedestrians are able to detect and recognize nearby hybrid and electric vehicles by requiring that hybrid and electric vehicles emit sound that pedestrians will be able to hear in a range of ambient environments and contain acoustic signal content that pedestrians will recognize as being emitted from a vehicle. The proposed standard establishes minimum sound requirements for hybrid and electric vehicles when operating under 30 kilometers per hour (km/h) (18 mph), when the vehicle's starting system is activated but the vehicle is stationary, and when the vehicle is operating in reverse. https://www.regulations.gov/document/NHTSA-2011-0148-0075 https://www.regulations.gov/document/NHTSA-2011-0148-0075