[auto réglé] Narrow street ?

[grosbil]

Soit B31.1 : A Narrow Street is represented by a road depiction overprinting >= one hexside [...]
Pour moi, c'est uniquement en village terrain, donc avec 2 bicoques de chaque côté...

Mais je peux me tromper. Si si, ça m'est déjà arrivé... enfin je crois 

Donc la question, sur le dessin joint, s'agit-il d'une narrow street permettant de placer le roadblock "à cheval" (B31.141)

[grosbil]

Je viens de trouver ma réponse dans les Perry Sez 

B31.1
Are the hexside roads present in hexes A5/A6 and GG5/GG6 on most boards also considered to be “narrow streets”?
A. No.

Or would a better definition be that the hexside road must have a building in both hexes shared by that hexside? (I haven’t done an absolutely exhaustive check, but a quick overview of available boards featuring narrow streets didn’t yield any counter-examples to that definition, other than PB X18, which is already covered by a dedicated rule.)
A. Buildings must be involved. {2}