This map from the Road Bureau shows the expressway routes as the Bureau defines them. The maps show the routes as of four years ago.
https://www.mlit.go.jp/road/sign/numbering/en/map/index.htmlhttps://www.mlit.go.jp/road/sign/numbering/map/index.htmlHere are the remaining E roads.
E69a) N151 could be named N151_Hou (from Houraikyou IC)
b) Add the Hamamatsuinasaki IC exit ~0.5 km NE of waypoint 15. It connects to P47.
E69Iid-- No changes
E69Uraa) N151 could be named N151_Tou (from Touei IC)
E69Yaha) N152 could be named N152_Hod (from Hodona IC). [There are other E69 ICs under construction that also intersect N152.]
E70-- No changes
E70Izua) N136/N414_Tak could be named N136/N414_OHC (from Oohitochuuou IC)
b) N136/N414_Ohi could be named N136/N414_OHM (from Oohitominami IC)
c) N136/N414_Ooh could be named N136/N414_Ood (from Oodaira IC).
d) N136/N414_Gat could be named N136/N414_Tsu (from Tsukigase IC)
E71-- No changes
E72-- No changes
E73a) 15(Chu), 16(Chu), 17(Chu) should be 15(E2A), 16(E2A), 17(E2A).
E74a) I believe E74 ends at 4(Ham).. The section between 4(Ham) and N9 is not part of the Hamada Expwy.
E75a) Add exit 4-1.
E76-- No changes
E76Sai-- No changes
E81a) Add exit 1-1.
E82a) Exit 1 is an entrance from N16, which is beneath E14. Add E14 as the initial waypoint before exit 1, and move waypoint 1 to where the onramp from N16 meets E82.
b) Exits 5-1 and 6 are intertwined. 5-1 is the exit for C4 and exit 6 is where E82 continues onto N126.
E83a) There is no exit 3 yet (2025). Remove waypoint 3.
b) The off-ramp part of exit 6 is S of the current waypoint, through the parking area. There is about 0.5 km between the two halves of exit 6. Either have a 6 and 6a or move the waypoint into a more central location.
c) N1_Min is not in Mineoka. It is in Tokiwadai town Yokohama, so maybe use N1_Tok instead of N1_Min.
d) Add exit 8. It is exit only going N. I found exit 8 signs on GSV.
http://www.openstreetmap.org/?lat=35.468639&lon=139.592946e) Add exit 9. It is exit only going S. On GSV exit signs say Mineoka and do not have the exit number 9 on them.
http://www.openstreetmap.org/?lat=35.465979&lon=139.591526f) Add exit 10. It is entrance only going S. I found exit 10 signs on GSV.
http://www.openstreetmap.org/?lat=35.460082&lon=139.587280g) According to the expwy wiki page, waypoints Kaw and P401 are exits 14 and 15. I could find no exit numbers using GSV.
h) N1_Hod is not in Hodogaya. It is in Kamiyabe town Yokohama, so maybe use N1_Kam instead of N1_Hod.
E84a) N134 could be named N134_Oiso (from Oiso town) to differentiate it from the N134 in E84Chi.
b) ToN135 could be named N1_OIK (from Ooisoko IC) - the N1 part is admittedly a stretch
c) N1_Oiso could be named N1_OIH (from Ooiso Higashi IC)
d) N1_Nin could be named N1_OIN (from Ooiso Nishi IC)
e) P71 is exit 1.
f) N1_Tac is exit 2.
g) P72 is exit 3.
h) P719 is exit 4.
i) N1_Oda is exit 5.
j) ToN135 is exit 6.
k) Remove N135. It is not an exit.
l) ManRd should be HakTpk (from Hakone Turnpike). “With its many sweeping corners and twists, the turnpike is an internationally renowned destination for sports car drivers, the Japanese motoring press, drifting enthusiasts and other local speed aficionados.”
m) E85 is exit 7.
n) N1_Iry is exit 8.
E84 new branchA branch of E84 heads south following the Ishibashi Branch Line from exit 6 to N135 at exit 9 in Ishibashi. Its either a new branch or a very long exit.
E84Chia) N134 could be named N134_Yan (from Yanagishima) to differentiate it from the N134 in E84.
E85a) Use the exit numbers from 1 to 9. E84 is exit 1. E1 is exit 9.
E86a) Uch could be named P326.
b) Add the exit at Uchinada Shirahodai, between Uch(P326) and P56.
http://www.openstreetmap.org/?lat=36.673126&lon=136.651211E87a) N23 could be named NE3/N23.
b) MinChiRd could be named ForMinChiRd. The Minami Chiba Road starts at the Handa IC at the next exit south of this IC.
c) Rin could be named P522_Rin and the waypoint could be moved slightly north to be more central between the N and S parts of the IC.
d) P522 could be named P522_Cen (from Centrair Higashi IC)
E88a) Waypoint 6 should be moved NE.
http://www.openstreetmap.org/?lat=34.904780&lon=135.767387b) Waypoint 7 should be named E89.
c) Add waypoint 7 (exit 7) about 1km W of E89.
http://www.openstreetmap.org/?lat=34.898839&lon=135.740573d) Waypoint 8 should be moved NE
http://www.openstreetmap.org/?lat=34.895776&lon=135.723116e) I think that E88 ends at the waypoint currently named E9. The connections to E1 are from that IC, so maybe rename this waypoint to E1/E9 and remove the E1_W waypoint.
E89a) According to the Daini Keihan Road Japanese wiki page, the 80# waypoints are not part of E89. E89 begins at waypoint 1, I’d guess at or near the toll booth. The Road Bureau map also shows E89 ending near waypoint 1.
b) If you decide to retain the 80# waypoints, they should have a dash between the 8 and the 0.
E90a) Add exit 4.
http://www.openstreetmap.org/?lat=34.512546&lon=135.443970b) P216 is exit 3.
c) Add exit 2.
http://www.openstreetmap.org/?lat=34.512308&lon=135.481435d) P61 is exit 1.
e) These exit numbers are listed on the expwy wiki page, but I could find no use of them in GSV 2020 views.
E91a) After waypoint 6, E91 continues east on the Yamato Takada Bypass, ending at the Shijo Ramp.
http://www.openstreetmap.org/?lat=34.502857&lon=135.788224E92a) Add exit 3.
b) Use the exit numbers for the existing waypoints.. N170 is exit 1. N308 is exit 5. Maybe flip the road direction so that the waypoints ascend.
E93-- No changes
E94a) E94 does not extend past E28 to waypoint 2.
b) Waypoint 3 should be named E28. 3 is an E28 exit number.
E95a) The first waypoint should be named N2
b) Add waypoint 1 at exit 1.
http://www.openstreetmap.org/?lat=34.801788&lon=134.743288c) Current waypoint 7 should be named E2A.
d) Add waypoint 7 at exit 7.
http://www.openstreetmap.org/?lat=34.941271&lon=134.760645E97-- No changes
C2a) E1A(5) could be E1A_E
b) E1A(10-1) could be E1A_W.
c) Current waypoint 5 should be 5-1.
d) Add exit 5. It is just south of current waypoint 5. It is an exit to P60.
http://www.openstreetmap.org/?lat=35.166422&lon=137.006464e) Waypoints 15,16,17 should be 14,15,16.
f) Add waypoint 17 at exit 17. It is an exit to N22.
http://www.openstreetmap.org/?lat=35.222160&lon=136.861539g) Add a waypoint between waypoints 17-1 and 18. The exit is considered the western part of exit 17 - the two parts are separated by 17-1.
http://www.openstreetmap.org/?lat=35.220617&lon=136.844759C2Hon-- No changes
C3Nag-- No changes
C3Ogaa) Waypoint P213 should be 17. P213 is exit 17.
C3Toi-- No changes