I'm down to the last NH in West Bengal -- 316A, and I'm finding no evidence outside of the Gazette of India article Wikipedia cites. It's supposedly a NH 316 spur mostly in Orissa/Odisha (the official language there is Odia, not Hindi or Bengali, and my friend in Kolkata says it's Odisha) that terminates with NH 116B in West Bengal. The itenary makes absolutely no sense, however, suggesting it's a route that first bounces west of NH 316 then north of NH 16, then back to the south of NH 16, wedged between 16 and the coast, while 16 isn't that far inland.
OSM has 116B heading west of Dhiga, WB, into Odisha and terminating soon thereafter, with WB 4 overlapping in WB and OD 57 in Odisha.
Google has no NH west of Dhiga, instead having OD 57 entering WB and ending in Dhiga (this itself is incorrect; WB has no state highway above 15).
Bing doesn't show 116B at all, but does show WB 4 running to the WB/OD border (WB State Police route descriptions agrees with this).
Mapquest agrees with OSM's routing, just not showing the SH overlaps.
And RMN agrees with OSM and MQ.
So with that in mind, no 316A.
The only truly unresolved question is how none of the online maps agree with each other when it comes to NH 27 and the Bihar/WB border.
To draft:
WB 1
4
4A
6
7
8
10
10A
11
11A
