and:
on your map-example I see "S"-es that are part of the road, right?
So these S-s are same as road tiles?
Then:
Check these parts on the lower part of your map:
- * - R
- * - -
- * - -
- S * *
isn't it 5 in 3x3? (bottom-right 3x3)
and:
* - *
- * -
S - -
here we have 4 but no horizontal or vertical alignment of 2 roads...
hm?
EDIT:
only thing I can accept that on these S-s there are no roads, roads only lead to them and end there
...but in this case the S does NOT mean continuity for the road, not for military supply, either...
on your map-example I see "S"-es that are part of the road, right?
So these S-s are same as road tiles?
Then:
Check these parts on the lower part of your map:
- * - R
- * - -
- * - -
- S * *
isn't it 5 in 3x3? (bottom-right 3x3)
and:
* - *
- * -
S - -
here we have 4 but no horizontal or vertical alignment of 2 roads...
hm?

EDIT:
only thing I can accept that on these S-s there are no roads, roads only lead to them and end there
...but in this case the S does NOT mean continuity for the road, not for military supply, either...