[OSM-talk] ferry route speed

Shaun McDonald shaun at shaunmcdonald.me.uk
Tue Sep 2 07:51:02 BST 2008


On 1 Sep 2008, at 23:54, Mark Williams wrote:

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> David Groom wrote:
>> When tagging ferry routes is anyone tagging ferry speed, and  if so  
>> do you
>> simply add maxspeed = ??  to thr route?
>>
>> david
>>
>>
> There was a recent discussion on the routing list about this - iirc we
> agreed to use a (low) assumed speed of 4-5Km/h for ferries (as opposed
> to the current practice of not routing them at all..)
>

That low speed is far too low. When I was on the Holyhead to Dublin  
ferries recently, my GPS was giving 45mph for the return journey, and  
25-30mph for the outward (different ferries, the return was the swift  
fastcraft).

If you want the GPS traces for analysis let me know.

I don't know if this low speed was used to take into account the 45  
minute checkin? However it would be a better option to say this point  
adds a 45 minute delay.

Shaun





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