[GraphHopper] Speed of OS ITN routing

[Peter]

Hi Stuart,

thanks for the follow up! When I introduced the pillar node / tower node
difference I got ~7 times faster code which makes your high numbers of
~30secs explainable.

> This is an easy fix however does seem to break some of ITN's turning
restrictions

How do you mean that? Is that just hard to implement or do you see a
GraphHopper limitation?

Regards,
Peter

On 28.11.2014 11:19, Stuart Adam wrote:
> As I suspected part of the issue with our speed when not using
> contraction hierarchies is that currently our code is introducing all
> nodes as towers rather than a mix of towers and pillars.  This is an
> easy fix however does seem to break some of ITN's turning restrictions
> so I won't be commiting that yet.  Obviously correct and legal is
> better than fast :-)

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