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咱们国家高速为什么最高限速120km/h?
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Topic: 咱们国家高速为什么最高限速120km/h? (Read 75 times)
Maria122
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咱们国家高速为什么最高限速120km/h?
June 06, 2017, 04:41:14 PM
#1
导读
我国《道路安全交通法》规定,机动车在高速公路行驶,最高不得超过120km/h的时速!那么为什么是120这个数字,而不是140、160、110呢?
一般来说,发达国家由于道路设施,和驾驶人员素质较高,所以把高速公路的的限速放的很高!当然,也不排除一些发达国家比较谨慎。我们来分析一下原因!
道路
之所以限定为120km/h是根据我国的道路设计标准而设定的!轮胎与路面的摩擦系数、车道坡度、防护栏的强度等,这些都是影响机动车速度的因素!
那么有些朋友就会有疑问,既然路不行,那就重新修路呗!重新修路的成本有多高?那我们根本就无法想象,另外,因为道路水平的提升,就改变法律的规定,也是不太现实的。因此,不重新修路的主要原因是成本!
驾驶员的状况
一般来说,高速驾驶的情况下,对于驾驶员的视力、视野、反应能力要求较高。一般来说,车速加快,人的视野和视力是在下降的!车速在72Km/h,正常为1.2的视力下降至0.7。车速到了100km/h,视野大大减小!
另外,人的反应时间一般为2.5秒(发现问题-想出办法-做出反应)。因此,在告诉上发现问题,踩下刹车,这短时间,车辆的滑行距离大约为83米!再加上惯性、制动等作用力,可能要上百米了!
当然,人和人的反应时间也是不仅相同的。有些人年龄偏大,视力、反应等就很自然的有所下降!因此,我们可以通过上述的理由,120km/h真的已经很快了!
车的因素
在我国,车辆跑到120km/h完全没有问题。如果在高速上发生了爆胎事件,那么还是有生还可能的!但是一旦到了200km/h。那生还的几率可以说就是0了!
那很多网友又会有疑问,为什么外国就可以速度那么快,甚至不限速!大家要注意,国家之间的情况不一样,有些国家的道路和防护栏的硬度比较大,因此速度快,这也和当地车辆多少有着直接的关系!
总结
说到底,国家规定时速为120km/h,是为了保证大家的安全,人们总说,十次事故九次快,可见,出了大事故一般都是因为车速快!所以,控制住自己,安全驾驶!
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