Today Is...Day of Silence

Canadian astronaut Chris Hadfield, mentioned something that struck him profoundly and something that i never really considered before, the complete silence of Space.
In our World, there is never complete silence. Even in the dead of night there is the tick of a clock, the distant sound of a car, your partners breathing or even the wind outside, never is there absolute silence but sometimes you don't want silence, as in when tonne of metal is hurtling around our roads at high speeds.
We are starting to see more and more electric cars on our streets but i do foresee a problem which i have already experienced while crossing the street, they are silent.
I got to the crossing just as the lights were turning back to amber and there sat a car, i looked at the driver, the driver looked at me and i thought that as his car was not making any noise, he had broken down or stalled at the lights.
Assuming i would have time to cross as he would have to re-start his engine, i stepped out just as he pulled away, silently.
I jumped back, apologised and waited for the next green man to flash but apart from me trying to cross roads, i can see silent cars being an issue, more so for pedestrians, especially visually impaired ones, and cyclists who rely on hearing approaching cars.
With the Government announcing that petrol and diesel vehicles are to be consigned to history on British roads by 2040 and the price of buying an electric vehicle tumbling, a tonne of metal travelling silently at 30mph around our streets is already causing problems with a report from the Guide Dogs charity found a 54% increase in pedestrian injuries in accidents involving quiet cars.
The EU have ruled that car builders must incorporate artificial sound generators in their cars but i guess when we cross the road we will just have to adhere less to the 'Listen' part of the 'Stop, Look and Listen' mantra we had drummed into us as children.