The National Highway Traffic Safety Administration (NHTSA) said the rule was needed because battery-powered vehicles are very quiet.
It 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 30kmh (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.
It would be more fun if drivers could customize what that sound is, such as "La Cucaracha" or the whine of a Shadow vessel.
Electric and hybrid cars are to include a noise generation device for travel at low speeds with no internal combustion engine: http://www.nhtsa.gov/About-NHTSA/Press-Releases/nhtsa_quiet_car_final_rule_11142016.
There goes my quiet electric future.
(Score: 0) by Anonymous Coward on Thursday November 17 2016, @02:42PM
I forget what it's called, but that mix of varying tones that start low and get higher in pitch as they fade away. The net effect is that it constantly sounds like it is getting higher and higher in pitch, without really changing much. Great for inducing anxiety...