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

[Peter Childs]

2009/7/30 Gervase Markham <gerv-gmane at gerv.net>:
> On 30/07/09 09:26, Aun Johnsen (via Webmail) wrote:
>> much more. Since many countries have two different signs for max legal
>> height and max physical height, and its usages can be very different, why
>> not allow this in tags?
>
> Can you provide sample images for such signs? I confess I find it hard
> to believe.
>
> The maxheight for a feature such as a bridge is the maximum height of an
> object of the standard type that will fit under it. So for a road
> bridge, it would be a bus or truck of the normal 1-lane width. That's
> the thing people are interested in. If there's a sign which says "the
> max physical height of a truck you can get under this bridge is 11 feet,
> but legally the max height for this bridge is 12 feet", how is the
> second piece of information useful in any way? For unicyclists?
>

I guess this means that its a humped bridge where you can get a 12foot
vehicle under it in the center but its only 11ft each side. Usually
combined with "On Coming Vehicles in Centre of Road" Signs..

Peter.