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Comment by Faaak | Hacker News Reader

Supposing the speed-controlled road spans 1km, then if you go at 100km/hour, it will take you 36s:

  You have: 1km/(100km/hour)
  You want: s
   * 36

With a second less, your speed would be miscalculated to:

  You have: 1km/(36s - 1s)
  You want: km/hour
   * 102.85714

So not really something to worry about

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Unless the road span in question is a 10m intersection. Now if you went through at 30km/hour it took you 1.2s, but lose that second and now you went through at 180 km/hr.

Go through at 60km/hour and you left the intersection before you entered it. Does that mean the government owes you the fine?

> Does that mean the government owes you the fine?

no it just means the fine is immediately overdue :)

in the UK, speed traps (that aren't "average speed check" traps) operate over a distance of ~10-30 meters, depending on the road's speed. that second is very important.

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