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- From: stevea@vast.unsw.edu.au (Steve Avery)
- Subject: Re: speed camera
- Message-ID: <STEVEA.92Nov23095341@mucket.vast.unsw.edu.au>
- Sender: news@usage.csd.unsw.OZ.AU
- Nntp-Posting-Host: mucket.vast.unsw.edu.au
- Organization: VaST Lab, CS & E, University of NSW, Sydney, Australia
- Distribution: aus
- Date: Sun, 22 Nov 1992 23:53:41 GMT
- Lines: 22
-
- Brent Curtis sez:
-
- I received an email query about this.
-
- "Why does facing traffic make a difference."
-
- Because a photo of the front of a bike doesn't identify a motorcycle.
- It has no number plate on the front.
-
- Actually, when I visited a certain federal government sponsored
- research facility in Melbourne last year, I was shown the tests they did
- to ascertain the best performance they could get from the camera
- pictures themselves.
- The limit on the pictures is two lanes, apparently due to
- trade-offs with camera speed (to prevent blurring) and granularity of
- the film (to make the plates readable). This means that if you are more
- than two lanes away from the camera, you're generally okay (I cannot
- ever remember seeing a speed camera set up where traffic moving away
- from the camera was greater than two lanes deep).
-
- cheers
- -steve
-