Mason Blake
Electric cars have been designed to emit sounds at lower speeds to alert pedestrians to a vehicle's location, speed, and direction of travel. This is because electric vehicles are almost silent, and natural sounds like tire and wind noise are only audible at greater speeds. The National Highway Traffic Safety Administration (NHTSA) has made it a requirement for electric cars and hybrids to emit noise when operating at speeds below 18.6 to 20 mph. Automakers have been given creative freedom to design unique sounds for their electric vehicles, with some partnering with renowned composers to create sounds that enhance the driving experience.
| Characteristics | Values |
|---|---|
| Purpose of sound emission | To alert pedestrians to a vehicle's location, speed and direction of travel |
| Regulatory requirements | National Highway Traffic Safety Administration (US); Regulation on the Sound Level of Motor Vehicles (EU) |
| Speed threshold for sound emission | Below 18.6 mph (US); 12.4 mph (EU) |
| Sound design | Creative freedom for automakers, but must meet minimum sound pressure levels and be consistent across the same make, model, year, body type and trim (US); no off switch for the driver (EU) |
| Sound type | Pedestrian alert; engine sounds; brand-specific melodies; vehicular operations |
| Examples | BMW i4 electric sedans (composed by Hans Zimmer); Fiat 500e; Hyundai IONIQ 5 N; Lotus Evora 414E Hybrid; Audi |
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What You'll Learn
Electric cars must emit sound at low speeds
Electric cars are required by law to emit sound at low speeds to alert pedestrians to their presence. This is due to the fact that electric vehicles can be silent, especially at low speeds, and can pose a danger to pedestrians, cyclists, and blind people. The National Highway Traffic Safety Administration (NHTSA) in the US has issued a ruling that requires electric vehicles and hybrids travelling at less than 18.6 mph (30 km/h) to emit warning sounds that can be heard over background noises. The European Union has a similar directive, requiring electric and hybrid vehicles to give a sound warning to pedestrians when travelling at speeds below 12 mph.
To comply with these regulations, automakers have developed various sound systems for their electric vehicles. For example, Enhanced Vehicle Acoustics (EVA) has developed an aftermarket technology called "Vehicular Operations Sound Emitting Systems" (VOSES) that makes electric vehicles sound more like conventional internal combustion engine cars. Other automakers, such as BMW and Fiat, have partnered with composers and musicians to design unique sounds for their electric vehicles.
While some people may oppose the introduction of artificial sounds as a warning for pedestrians, arguing that it increases noise pollution, the safety benefits of these systems are clear. The NHTSA estimates that the new warning noises will prevent 2,800 pedestrian and cyclist injuries during the life of each model year of electric and hybrid vehicles. Additionally, the sound systems can provide an immersive and dynamic driving experience for drivers, enhancing the overall customer experience.
Overall, the requirement for electric cars to emit sound at low speeds is an important safety measure that can help protect vulnerable road users. It also showcases the innovative approaches automakers are taking to sound design, creating a unique and captivating driving experience for their customers.
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The sounds alert pedestrians to the vehicle's presence
Electric cars are designed to emit sounds to alert pedestrians to their presence, especially those who are blind or visually impaired. These sounds are meant to be heard over background noises and provide an indication of the vehicle's location, speed, and direction of travel. The National Highway Traffic Safety Administration (NHTSA) in the United States has mandated that electric vehicles and hybrids emit warning sounds when travelling below approximately 20 mph. Similarly, an EU law, the Regulation on the Sound Level of Motor Vehicles, requires all new electric cars to make a sound at speeds up to 12.4 mph in both forward and reverse directions.
To comply with these regulations, automakers have incorporated creative sound design in their electric vehicles. For example, BMW collaborated with composer Hans Zimmer to design the sounds for its i4 electric sedans. Fiat's 500e sings a digital melody at certain speeds, while Dodge's Charger Daytona EV creates a "deep rumble and visceral feel" reminiscent of traditional muscle cars. Some sounds are designed to be more loud and grungy, like the GMC Hummer, to indicate the presence of a large vehicle.
The sounds emitted by electric cars are generated through external speakers and can vary in volume and tone depending on the vehicle's speed. For instance, the Hyundai IONIQ 5 N employs an electric car sound emitter with eight internal and two external speakers, allowing drivers to gauge the power being harnessed. Additionally, some systems provide different sounds inside the car compared to the sound emitted externally.
While these sound emitters enhance safety for pedestrians, there are concerns about increasing noise pollution. Anti-noise and electric car advocates have opposed the introduction of artificial warning sounds, arguing for a standardized tone to avoid a "cacophony of confusion" on the streets.
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Car makers have creative freedom with the sounds
Electric cars are required by law to emit warning sounds or pedestrian alert noises when travelling at low speeds, usually below 20 mph. This is to ensure the safety of pedestrians, especially those who are visually impaired. While adhering to these regulations, automakers' sound designers are given creative freedom to shape the auditory landscape of electric cars.
Creative sound directors and engineers work to design sounds that are not only regulatory compliant but also enhance the driving experience, making it immersive and dynamic. For instance, Jay Kapadia and his team used a didgeridoo and sounds recorded from the sun to create melodic tunes for electric Cadillacs. Similarly, Dodge's Charger Daytona EV was designed with a "Fratzonic Chambered Exhaust" system, which produces a deep rumble reminiscent of traditional muscle cars.
Some automakers have partnered with renowned composers to design unique sounds for their electric vehicles. For example, BMW collaborated with Hans Zimmer, the composer known for his work in films like "Dune" and "The Lion King," to create the sounds for its i4 electric sedans. Fiat also stands out with its 500e model, which sings a digital melody at certain speeds, offering a "taste of Italian culture."
Hyundai, a leader in electric car sound innovation, introduced the IONIQ 5 N with its N Active Sound + technology. This feature offers three sound styles, including a futuristic electric car sound and familiar engine and exhaust noises. Hyundai's Sound Research Lab utilizes driving simulators and virtual reality to develop captivating sound experiences that enhance decision-making and driving pleasure.
In conclusion, while electric cars must adhere to safety regulations regarding warning sounds, automakers are given creative freedom to design unique and immersive soundscapes that enhance the driving experience and shape the future of mobility. These sounds are carefully crafted to evoke emotions and create a distinct auditory identity for each vehicle brand.
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The sounds are designed to enhance the driving experience
Electric cars are designed to emit sounds to alert pedestrians to a vehicle’s location, speed, and direction of travel. These sounds are particularly critical for pedestrians who are blind or visually impaired. However, beyond safety, the sounds of electric cars are also designed to enhance the driving experience.
The Hyundai Motor Group, for example, has developed N Active Sound +, a technology that offers a sonic reference point with three available sound styles for the car. It integrates the familiar engine and exhaust noises typically associated with petrol-fuelled cars while also producing varied noises based on the user's preferences. This feature provides drivers with intuitive auditory feedback directly corresponding to the motor torque output, enabling them to better gauge the amount of power being harnessed during their drive.
BMW took a different approach by partnering with renowned composer Hans Zimmer to design the sounds for its i4 electric sedans. Fiat, on the other hand, has its 500e sing a digital melody at certain speeds, meant to share a "taste of Italian culture." These examples demonstrate how automakers are creating unique and immersive sound experiences for their electric vehicles, adding a layer of enjoyment to the driving experience.
Additionally, the absence of engine noise in electric vehicles allows for innovative sound design that can evoke emotions and create a sense of immersion. Creative sound director Jay Kapadia, for instance, used a didgeridoo and sounds recorded from the sun to build the melodic tunes of electric Cadillacs. This approach transforms the driving experience into a dynamic and captivating journey.
In conclusion, while the primary purpose of sound emitters in electric cars is to enhance safety, particularly for vulnerable pedestrians, automakers have also recognized the potential to elevate the driving experience through sound design. By incorporating creative and immersive soundscapes, electric car manufacturers are not only complying with regulations but also shaping a new auditory landscape that adds a unique dimension to the joy of driving.
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Some sounds are designed to mimic engine noises
Electric vehicles (EVs) are nearly silent without fake engine noise. The National Highway Traffic Safety Administration (NHTSA) has mandated that electric cars and hybrids emit noise when operating at speeds below roughly 20 mph. This is to alert pedestrians to a vehicle's location, speed, and direction of travel. Automakers have thus introduced fake engine noises in their electric cars to comply with the mandate.
Some drivers say that electric cars are too quiet, while others find the absence of sound soothing. The fake engine noise is meant to give drivers the nostalgic appeal of the feeling of driving a car with an engine that makes noise. Most driving enthusiasts agree that being behind the wheel involves many senses, and part of the fun of going fast is hearing an engine roar. An EV's synthetic engine noise gives drivers a tiny bit of the auditory sensation found in a roaring V8.
The Dodge Charger Daytona EV, for instance, has a 600-watt roar to mimic a muscle car's engine, using a series of woofers and midrange speakers that combine through a chamber. The automaker calls it "Fratzonic Chambered Exhaust." Similarly, Enhanced Vehicle Acoustics (EVA), a company based in Silicon Valley, developed an aftermarket technology called "Vehicular Operations Sound Emitting Systems" (VOSES). The device makes hybrid electric vehicles sound more like conventional internal combustion engine cars when the vehicle goes into silent electric mode (EV mode), but at a fraction of the sound level of most vehicles.
Other automakers have also introduced fake engine noises in their electric cars. For instance, BMW partnered with Hans Zimmer, the composer behind the film scores for "Dune" and "The Lion King," to design the sounds for its i4 electric sedans. Fiat has its 500e sing a digital melody at certain speeds meant to share a "taste of Italian culture." Hyundai's N Active Sound + enhances the electric car driving experience by offering a sonic reference point with three available sound styles for the car. In addition to generating a futuristic electric car sound, this feature integrates the familiar engine and exhaust noises typically associated with petrol-fuelled cars.
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Frequently asked questions
Yes, electric cars do make some sound, although it is usually much lower than that of cars with internal combustion engines. The primary sources of sound in electric cars are the motor whine, wind, and road noise.
Electric cars are very quiet, especially at low speeds, which can be a safety hazard for pedestrians, cyclists, and other road users. Acoustic vehicle alert systems (AVAS) are designed to warn others of the vehicle's presence.
Since 1 July 2019, it has been a legal requirement in the EU for all new electric cars to be fitted with sound-emitting devices. However, some car manufacturers, such as Mitsubishi, Nissan, and Toyota, had already been fitting AVAS to their electric vehicles before this date.
While some systems can be temporarily deactivated by the driver, others cannot be switched off. Some carmakers have chosen to alter the loudness in line with the car’s speed instead.
Some electric cars emit a warning noise designed to alert pedestrians and other road users. Others use sound emitters to enhance the driver experience, providing a sonic reference point with different sound styles and engine sounds similar to those of conventional cars.
