Us demands Acoustic Vehicle Alerting System (AVAS) to be put in Hybrid or Electric cars.

As electric or Hybrid cars makes lesser noise than internal combustion engine cars, it is of essence that a certain tone or sound is used to know when the electric car is approaching so as to alert pedestrians.
A rule was placed to ensure that a tone or an alerting device is installed in the electric or Hybrid cars.

The National Highway Traffic Safety Administration (NHTSA) in the US said the rule was needed because battery-powered vehicles are very quiet.
The body said the rule would particularly help blind pedestrians, or those with a visual impairment, detect electric cars and hybrids on the road.
The new safety rule could help prevent 2,400 injuries a year, said the NHTSA.
The rule demands that the cars make a noise when travelling either forwards or backwards at speeds of less than 30km/h (19mph). The regulation covers vehicles with four wheels that weigh less than 10,000 pounds (4.5 tonnes).
The safety specification requires car makers to use a two-tone signal similar to that currently emitted by heavy vehicles when they are reversing.
At higher speeds, said the NHTSA, tyre and wind noise would be loud enough to alert people to the presence of a vehicle.
"We all depend on our senses to alert us to possible danger," said Anthony Foxx, US transportation secretary, in a statement.
He added that it had become more important to hear vehicles as quieter hybrid and electric cars become more popular.
Car manufacturers are given till 1 September 2019 to make changes to ensure that all new vehicles are fitted with sound systems to generate the noise. 
As for the existing models on roads, they have another two years to have it installed.

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