[Talk-GB] Lorries can't limbo

[James Derrick]

On 13/11/2020 09:06, Philip Barnes wrote:
> Also I have been thinking of height restrictions on level crossings
> where the railway is electrified.
>
> I believe that the East Coast line has level crossings?

After many years looking out of the window travelling from NCL to EDI on 
the East Coast Main Line (ECML is a common abbreviation - e.g. in bridge 
references), I'd give a special mention to the rural level crossings 
which have two poles and a line of suspended bells across the track to 
(hopefully) alert any machinery operators that Something Bad Is About to 
Happen!

'got_bells_on = yes' perhaps? :-)

Sadly, I don't have specific examples, just the memory of countryside, 
likely either side of Berwick.


A little more seriously, several types of infrastructure have 
over-height detection kit - e.g. the Tyne Tunnel has broken beam 
detectors across the carriageway about 1km from the tunnel portal.

Look for the poles with two sets of broken beam kit abode the 30 sign in 
this image:
https://www.mapillary.com/map/im/LdqV481D4eAHnvBvrcgKEg

This height restriction is more complex as to add a safety cell 
(evacuation route) to the original Northbound circular bore, the lanes 
were moved off-centre. This means lane 1 has greater clearance than lane 
2 - creating the regular task of replacing the signage above lane 2 when 
a lorry driver decides to illegally overtake! donk, donk, donk, crash...

And yes, the approach bridges are 'got_bells_on = yes':
https://www.mapillary.com/map/im/QvgXLAvET7V3xjEdX2Ir_g


The question with the TT is how to tag 5.1 m lane 1 and 4.0 m lane 2 on 
a single highway=trunk; lanes=2?

It's not tagged today, so adding the 5.1m to the trunk would make sense 
as 4.0m would give a false routing.

I'm not personally a fan of the analagous way lane tagging is used to 
model the A1 further north (turn:lanes=through|through|right), as it's 
not human readable on most renders (#include <don't tag for the renderer>).


James
-- 
James Derrick
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