[Tagging] Usefulness of bicycle=dismount on ways

[Mike N]

On 10/10/2013 1:55 PM, Jonathan wrote:
> The only way to tag the effect that the sign has is to change the access
> tag to exclude bicycles.

What about hints to the router that it's OK to send cyclists on this 
route instead of taking a longer route?   Knowing that speed = walking 
speed + time to mount/dismount allows it to make a decision when to take 
a longer fully rideable route VS dismounting.