[OSM-talk] highway=motorway|trunk|primary(_link)

[Simon Hewison]

Iván Sánchez Ortega wrote:
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> El Jueves 28 de Diciembre de 2006 12:54, Jochen Topf escribió:
>> Two motorways are linked by highway=motorway_link, two trunk roads by
>> trunk_link, thats obvious. But how should a motorway be linked to a
>> trunk road? motorway_link or trunk_link?
> 
> IMHO, it should be a motorway_link.
> 
> My understanding of the different types of roads (motorway, trunk, primary, 
> etc) is that a motorway is more important than a trunk, that is more 
> important than a primary. Thus, any road connecting to a motorway should be a 
> motorway_link, regardless of the type of road connecting to it.

motorway_link is a link road that isn't part of the main motorway, but is 
subject to the typical regulations associated with the motorway.

In most countries, this restriction is: No pedestrians, No pedal cycles, No 
horses, No livestock, and no low-powered motorcycles. Some countries prevent 
learner drivers from driving along motorways.

On a typical motorway junction with a roundabout serving it and a trunk 
road, the slip-roads (aka off-ramps and on-ramps) are highway=motorway_link; 
oneway=true. The roundabout is highway=trunk; junction=roundabout; 
oneway=true. The main motorway carriageways are highway=motorway.

Typically, rendered would render motorway_link the same colour as motorway, 
but thinner; likewise, trunk_link would be the same colour as trunk, but 
thinner, and so on.
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Simon Hewison