
If you’ve been walking the streets of London recently, you might have seen more and more silver Toyotas tucked in amongst the ranks of parked motors. It's pleasing to see the Prius hybrid, along with other dual and fully-electric cars, infiltrate the transport norms of urban and sub-urban society. But while the hawk-eyed may have seen these slowly multiplying series-parallel hybrids, they might not have heard them.
For the electric motors used in these cars are notoriously silent; stealthy, in fact. Indeed it is often touted in associated marketing as a good reason to buy one- less noise pollution for your street when starting the car at 6am, lighter on your eardrums, etc.
But just as speedy cyclists can slice into oblivious pedestrians who cross the road without looking, hybrid and electric cars can be a danger. Cyclists at least have the option of a bell; these cars, at present, have nothing. The silence of electric and hybrid cars has in this way been called into question.
Hybrid cars, running on their electric motors when travelling at low speeds, generally don’t make use of their louder internal combustion engines until a higher speed has been reached (this engine is what charges the internal battery).
The United States Congress is already considering legislation that would require an audible warning being built into electric cars to alert pedestrians of their approach. The English Ministry of Transport is also addressing the issue, drawing up a report to be published by the end of the year. The issue of blind persons, who often use their ears to listen out for approaching traffic before crossing a road, is one of the key concerns. The car manufacturing industry, however, is split on how to approach the issue; Nissan, for example, have been developing a range of sounds that could be added to the vehicle (including a ‘chime’, a melody, and a ‘whir’), whilst other engineers are reluctant to spoil the accumulated development of specialised engineering, decades in the making, which has finally seen the results of their ideal made manifest: a silent and smooth car engine.
One possible solution is the inclusion of a sound-emitting device, stimulated ‘on demand’- a built-in noise-maker that emits a personalised sound (perhaps even one recorded by the driver) when a button is pressed: thus allowing drivers to alert oblivious pedestrians if necessary but without creating an uncontrollable, unstoppable noise for the car that might counteract the benefits of a quieter engine.
A ringtone for your car? Let’s hope that instead we’ll be hearing simulated warp-speed and the soft bleeps, hums and clicks of docking spaceships.
Posted under Cars & Transport, Environmental News, Product Innovations, Uncategorized
This post was written by Barnaby Tidman on October 20, 2009
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