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Too Close speed limit sign

April 12, 2012
Too_close_for

I saw this sign on the back of a van and thought there must be some maths in here.
The idea is that if you can read the 30, you’re too close for driving at 30mph. Same for 50 and 70.

So: Where is the Maths in this?

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2 Comments
  1. fionajw permalink

    Had a quick scoot about and found the company who make these, the explanation on how they work is in the 4th paragraph:http://www.tailguardian.com/howitworks.htm

  2. Anonymous permalink

    Thanks for the link Fiona!Dave

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