Since the hybrid phenomenon started a question popped up in my brain. The hybrid cars have the capability to drive through electric motor thanks to batteries. And also they are very silent, efficient and you know the rest. Hybrids are the tree huggers!But there was a minor detail many people ignored! The electric engines are too silent, that’s not something bad but they too silent for pedestrians. You won’t notice this until a hybrid was one meter away to hit you.
The ultra silent hybrids emerged a new problem of car sound. Because, many of us understand that a car is approaching to us by hearing the engine noise. And hybrids do not have an engine noise while they are using the electric motor. So, we will not hear anything and hybrid might crash to us. I think there are some incidents have happened. 
Today Toyota announced that, they will be coupling hybrid vehicles with virtual engine noise! I have never seen more ridiculous that this. A car is making faking noise !?! I hope they will be working with game companies. I cannot imagine this hilarious condition of automotive business. They are trying to find ways to make fake engine noise. I am sure some tuning companies will remap the noise and your Toyota Prius can sound like a Ferrari :)
I am sure some ladies are reading this blog, and I would like provide a different explanation. Hybrids situation is like making fake noises for your high heels and help other people to realize that you are approaching. It is that simple :)
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Toyota, Lexus