[OSM-talk] [tagging] Feature Proposal - RFC - Clearance

[John Smith]

--- On Thu, 30/7/09, Roy Wallace <waldo000000 at gmail.com> wrote:

> different". This, I would argue, is a reason to allow for
> the

How much does the physical height exceed the legal height in most cases?

> possibility to differentiate between maxheight:physical
> and
> maxheight:legal.

If maxheight already implies the legal height there is no need to make things convulted for the sake of it, otherwise we'd be typing denomination=the_church_of_jesus_christ_of_latter-day_saints 

> Does anyone have any arguments against the above scheme,
> and if so, do
> they outweigh the arguments for it?

If the bridge has a horizontal bottom and the way underneath is flat most of the time the legal and physical maximums will be about 15cm different, breathing room if you like.

However if the above criteria isn't met the physical difference will vary, say the way dips underneath it wouldn't be the same as the entry or exit from under the obstruction. Or the previous example of one side the lane being different to the other, this won't help trucks as they can't make themselves the same size as unicyclists.