On Wed, 2005-01-26 at 14:03 +0000, Alan B. Pearce wrote:
> The second stlye are portable ones which show a smiley face if you are below
> the speed limit, but I cannot remember if they show a frowning face or
> actual speed if you are above the limit. These are designed for local
> councils to move around to remind people what the speed limit is, without
> doing any actual enforcement by issuing tickets.

Have never myself seen the "smiley" face one, but ours read your speed
continuously, and if your over the limit they start flashing the number.
I've seen similar ones in Austria. TTYL
 

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