This is not a complete review.
First off, the title should be Vietnam UNESCAP / ASEAN Asian Highways, since UNESCAP does not recognize AH132.
Source:
2019 logThe length of 94.725 km in Lang Son province exactly matches staying on QL1 rather than what we have on CT01. It doesn't join CT01 until our point QL1/31.
It appears that AH1 leaves CT01 at DaoXuy and follows QL1 south of there (based on 35.275 km in Ha Nam province).
The route thru Thanh Hoa seems to be correct based on 2.45 km between QL47 and QL45.
Per 33.4 km between QL7 and QL46 and the next two lines, it looks like AH1 goes thru Vinh rather than around on the bypass. But if QL1 has been moved to the bypass, AH1 presumably moved with it.
I can't tell about bypasses of Ha Tinh and Ky Anh.
It looks like AH1 stays with QL1 past Da Nang and Quang Ngai rather than using any of CT01 there.
AH14 follows QL5 from Hai Phong to Ha Noi. The east end is at our point DT356 east of downtown Hai Phong.
Thru Ha Noi, it's 11.135 km on QL5 in Ha Noi province, which takes it to DurNVC. 9.38 km is too long on old QL1 to Thi Tran Yen Vien, but 18 km matches QL3 from Thi Tran Yen Vien to QL2 at Phu Lo, and 13.5 km is close for QL2 to the next province.
So from DurNVC AH 14 turns northeast to the bridge into Yen Vien, northwest on QL3 to Phu Lo, and west on QL2 to rejoin our route at QL2_E, only to leave our route immediately and follow QL2 to Doan Hung, then QL70 all the way to the border in Lao Cai.
AH15 includes a piece east of AH1, following QL46 from the end north of Cua Lo (??) to the junction with QL1/AH1 north of downtown Vinh.
AH16 follows the OSM primary route through downtown Dong Ha (11.922 km east of our QL15 point).
AH17 begins north of downtown Da Nang at the end of QL14B (Cang Tien Sa) and follows QL14B to our QL1 point.
I can't figure out the QL14C lines in AH17.
The south end of AH17 is 36.14 km into Ba Ria-Vung Tau province, which seems to be at what OSM shows as a split with QL51A.
https://www.unescap.org/sites/default/d8files/AH%20Agreement%20with%20Amended%20Annex%20I-%202020_EN.pdf says AH21 begins at Quy Nhon port (east of AH1).
Sources list AH131 from Mu Da (border crossing at LAO AH131) to Vung Ang Port, 137.0 km. That seems to be the distance to the port (minus the AH1 overlap).
Sources list AH132 as 198.2 km. We have 183.2 km (subtracting the AH17 overlap), meaning there's another 15 km.
https://www.eria.org/uploads/media/Research-Project-Report/2020-02-Trilateral-Highway-Report/2b-Background-Paper-4.pdf p. 3 shows a piece from Dung Quat port to AH1 at Doc Soi, which seems to be what OSM labels Doc Soi - Dung Quat north of Chau O.
