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Thursday afternoon in a 60 zone, this 34-year-old motorcyclist was on his way home.
星期四下午，在一条速限60公里的路上，这位34岁的摩托车骑士正在回家的路上
It's our job to work out why he never got there.
让我们来说明他为什么回不了家
The rider broke his neck on impact here, having crashed into this car that was turning right.
这位骑士在撞击时弄断了脖子，他撞上了要右转的车
By analysing the impact, we know he hit the car at 30km/h.
我们分析了一下，他在冲撞时的速率是每小时30公里
And these marks on the road tell us that he skidded for 21m, having braked hard here.
从路上的煞车痕可以看出他在煞车后滑行了21公尺
When he first reacted, he was doing 68.
当他意识到前方车辆时，车速是每小时68公里
But let's change one small thing.
现在来做一个小小的改变
At 60, the driver would have had more chance to see him properly,
若车速是每小时60公里，车上的驾驶将有更多机会注意到他
he'd have stayed in control and reached this point a moment later.
他也不会因此失控，并能安全渡过
The car would have cleared his path and he'd be home by now.
车子将不会撞到他，而他现在也已经安然无恙的到家了
You decide on your speed. The physics decides whether you live or die.
你可以决定车速。但物理定律将决定你的生死
