Electric cars can creep up on you and suddenly come quite close. Now, they make a sort of whirring noise that could just as well be mistaken for a UFO, or a slow sort of plane. There’s a good reason for that fake engine sound, whether it’s emitted by a car or an electric bus. Public transport companies in some places have introduced a uniform artificial sound that could eventually change the audio landscape in our cities. Those changes will come as local transport gradually goes electric. Take Berlin, with its 138 electric buses moving through the streets and a further 90 on order. Nationwide,…