2010/1/2 Roy Wallace <waldo000...@gmail.com>:
> On Sat, Jan 2, 2010 at 2:39 AM, Ben Laenen <benlae...@gmail.com> wrote:
>>
>> So, numbers on signs about restrictions (maximum speed, maximum height,
>> maximum length, maximum weight...): trailing zeros have no value, as those
>> numbers are "exact".
>
> Not necessarily. Perhaps the number on the sign came from a
> measurement? E.g. "Maximum Clearance: 2.0" Perhaps this is a case of
> ambiguity between whether the number refers to a "restriction" or to
> physical clearance. I suspect this ambiguity is quite common.

This came up some time ago, there was a thread about maxheight and
maxheight:physical and I think the majority of the time signs indicate
the legal clearance. You can see this clearly if you find a bridge
that is sloped, like one near here has 5.0m on both side even though
you could clearly have half a metre more on the higher side.

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