I would move 11-01 to where the on-ramp merges into the main line, and add 11-02 where the off-ramp splits off the main line, i.e.:
HE1 http://www.openstreetmap.org/?lat=34.693696&lon=135.496166
11-02 http://www.openstreetmap.org/?lat=34.694367&lon=135.493671
11-01 http://www.openstreetmap.org/?lat=34.695059&lon=135.492464
11-03 http://www.openstreetmap.org/?lat=34.697789&lon=135.490190
In addition, I'd add a wp to N2:
N1/N25 http://www.openstreetmap.org/?lat=34.698232&lon=135.500547
ToH11 http://www.openstreetmap.org/?lat=34.697307&lon=135.491888
P41_A http://www.openstreetmap.org/?lat=34.695575&lon=135.487145
Not sure if ToH11 is the best label name since it's more like a "FromH11"

We would not get a graph connection but I think that HE11 and N2 do need those wps according to our rules.