“响亮的新利18苹果下载管道拯救生命”的支持者的坏消息。他们没有做任何这样的事情，而且最简单的原因是：汽车司机听不到巨大的摩托车。

Having demonstrated some time back that even brightly coloured and exotic-looking bikes – in my case an almost fluorescent Benelli 1130 Tornado Tre – don’t get through to drivers, this is not welcome news. A potplant in a Volvo (old Australian expression for gormless drivers) moved into my lane and almost punched me into the side of a bus. What’s left?

有趣的是，在那种特定的情况下，大声的管道可能已经帮助 - 见下文。但是让我们从一开始就开始。

我们都知道摩托车往往往往忽视交通。真的，虽然悲伤。我们还知道嘈杂的管道警报驱动程序到我们的存在。甚至更遗憾，不是真的。不相信我？我有证据，虽然来自罗马尼亚。

罗马尼亚专业摩托车协会为国家发展摩托车联盟，与董事会布加勒斯特大学和噪音排放专家Enviro Carmunce一起进行了一项研究，以确定摩托车噪声实际上是多少摩托车噪声。

Specifically, the question they wanted answered was where and when the motorcycle becomes audible in the passenger compartment. They found it difficult to measure this while driving with any scientific accuracy, so the research group conducted the tests while the car was stationary – but with the motorcycle at maximum revs.

与此同时，汽车的发动机保持在2,500至3,000档之间，无线电设定为20分贝，卷被认为是正常的。然后摩托车在汽车后面的前15米处放置，然后十米，然后在汽车旁边，最后在车前。

因此，我们（或者罗马尼亚人）在这里具有静止噪声测量，就像警察使用的那样，只有最大的摩托车发动机速度，具有相应极高的声压。声压是所有频率的总体。

如果你认为摩托车嚎叫声啸叫的声音在车里只有15米就会让司机抓住他的头，你遗憾地误。摩托车在汽车后面的15米处根本不听话，这是城市地区推荐的车辆之间的最小距离。在十米的距离距离的情况并不更好。汽车的隔音和频率的声压的组合，它产生自身的频率，包括20dB无线电，大于摩托车的噪音。

在此距离下方，摩托车慢慢地在汽车中感到可听。但这是摩擦：这只是声压，所有频率的总数。这并不意味着驾驶员可以从到达他的噪音中挑选摩托车的声音。这是一个特定的问题，因为即使，只有非常低的频率到达内部，这些耳朵不仅更难以识别，而且更难以在其他频率中隔离。

最后，随着汽车后轮的摩托车水平的前轮，第一次在汽车中清晰地听到摩托车的声压。然而，只有测试的六个自行车的最大响亮，它只能听到它的排气110分贝。因此，即使他们与汽车向上移动水平，其他五个摩托车仍远低于声音极限。

换句话说,普通摩托车只会really become audible in the interior of the car when it is level with it. By then it is pretty much too late to abort a lane change or any other move on the part of the driver. So the window in which loud pipes might be considered to save lives is quite small.

这是研究的一些背景。最大Revs测试最响亮和最安静的摩托车之间的差异在30分贝不到30分贝，换句话说，响度的感知差异是十几倍。

On average, the difference in sound pressure in front of and behind the motorcycle was measured at seven decibels. Behind the motorcycle, then, the noise is perceived as more than twice as loud as in front of the motorcycle. That’s a problem when you want drivers in front of you to be aware of your presence – and presumably not annoy the drivers behind you too much.

Although that problem might not be too bad because the sound pressure inside the car decreases again when compared to the measurement next to the car. Cars are apparently designed to be as soundproof as possible from the front.

This is not good. But all is not lost. My own research, conducted intermittently over several decades, suggests that there are auditory and visual cues that work to keep riders safe on the road. Unfortunately these include not only aggressively loud pipes but also a scratched flat black half-helmet, tight-fitting shades over a grey beard (a long one on the blokes), colours worn over scuffed leather jackets and stained jeans.

并提醒我不要从罗马尼亚购买任何二手自行车。

熊的照片或熊）