The first report shows the number of pedestrian crashes at potential low-speed maneuvers between the two types of engine types, given a sample size of just over half a million cars (8,387 HEVs and 559,703 ICE vehicles).
Manufacturers have until September 1, 2019, to equip all new hybrid and electric vehicles with sounds that meet the new federal safety standard.
"We all depend on our senses to alert us to possible danger", US Transportation Secretary Anthony Foxx said, as quoted by an NHTSA press release. The rule will apply to all vehicles with four wheels and a gross vehicle weight rating of 4,535kg (10,000lb) or less.
A United States road safety body has demanded that electric cars travelling at low speed make a noise to warn pedestrians.
The National Highway Traffic Safety Administration has completed its Quiet Car rule which has been created to ensure that pedestrians don't get hurt by these whisper-quiet cars.
Electric cars can be very quiet considering the fact that they don't have a conventional internal combustion engine.
Climate change 'turning point' as greenhouse gas levels flatten off
The report said Chinese carbon dioxide emissions decreased 0.7 percent in 2015 and are estimated to dip 0.5 percent in 2016. According to the data, global Carbon dioxide emissions are projected to increase only 0.2 percent this year over 2015.
Implementation of the rule could help prevent about 2,400 pedestrian injuries a year once all hybrids on the road are equipped to make noise, according to the National Highway Traffic Safety Administration.
'With pedestrian fatalities on the rise, it is vitally important we take every action to protect the most vulnerable road users, ' he continued.
The requirement was originally required by the Pedestrian Safety Enhancement Act of 2010, and was proposed by the NHTSA to the public in early 2013 to be ratified the following year, but was ultimately delayed until March 2016.
The NHTSA then estimated that the chances of a quiet hybrid or electric vehicle causing an accident involving a pedestrian was 19 percent higher compared to a noise-making gas-powered vehicle. Automotive News reported that the OEMs would have to add an "external waterproof speaker", and NHSA describes something like a marine speaker in its final rule.
"This regulation will ensure that blind Americans can continue to travel safely and independently as we work, learn, shop, and engage in all facets of community life", the federation's president, Mark A. Riccobono, said in a statement.
The safety specification requires auto makers to use a two-tone signal similar to that now emitted by heavy vehicles when they are reversing.