[Talk-ca] Secret routing demo.

[Richard Weait]

More fixes near Sydney, NS.  This _will_ be routable. ;-)

There are large sections of hwy 125 that are drawn as single
carriageway and highway=motorway.  This implies oneway=yes, so we can
go to Sydney but never return.  Nice place, I'm sure.

It does appear to have grade separated interchanges.

The "really right thing to do" is to survey it and determine if either:
- there is a central barrier, and draw as dual carriageway
- no barrier, and redefine as trunk

I'm not there, so in the interest of doing the least damage, I'm going
with a single carriageway, highway=motorway, oneway=no.

There are lots of other little fixups here; correct direction of
_link, add _links in places, grade separate and add layers for bridges
(hello, PotM!)

Now moving to Sydney Mines on 125.
Fixed 125 and Seaview Drive interchange.