Half a croissant, on a plate, with a sign in front of it saying '50c'
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Professional croissant on closed course. Do not attempt.

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Electric V-rroom!

Batteries included
  (+4)
(+4)
  [vote for,
against]

Electric cars and mobility scooters are very quiet,I find it difficult to hear them sneaking around.

By attaching Hot Rodder engine battery operated toy bike engines to these electric vehicles I may now hear their approach and jump to one side.

skinflaps, May 17 2013

Listen http://www.youtube....watch?v=Jk2t2hIATCU
Now imagine a freeway full of them during rush hour, at various pitches and speeds [FlyingToaster, May 17 2013]

No, like this: https://www.youtube...watch?v=q-fNGfiFsdU
[DIYMatt, May 17 2013]

More like this http://img2.etsysta...570xN.249571178.jpg
Vroom bicycle toy [skinflaps, May 17 2013]

[link]






       [+] but long ago I decided on <link> for my electric car sound.
FlyingToaster, May 17 2013
  

       You would be far, far from the first person to suggest electric cars that make engine noises. Personally I think if you're going to have a louder electric car, you should give it a unique electric noise, like the Tesla Roadster.
DIYMatt, May 17 2013
  

       Pennies in the hubcaps. Actually this is an opportunity for some enterprising grad student eith a 3d printer to print out an infinity of variations of "penny" and "hubcap" shapes to see what cobination produce the most/ most-interesting sounds.
JesusHChrist, May 17 2013
  

       Who still has hubcaps?
DIYMatt, May 17 2013
  

       So...electric vehicle noisemakers? Baked, although [+] for the way you suggest producing the noise.   

       In the USA, there's actually been talk (and at least one proposed law) regarding making noisemakers mandatory in electric cars for safety reasons.   

       Mobility scooters...the thought of a loud vroom coming from one of those would be hilarious. Same goes golf carts...
wolstech, May 19 2013
  
      
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