format - h a.a(0)a(0)000

type:
private: symbol - white, background - blue
truck and bus: symbol - black, background - yellow
police and army: symbol - black, red, background - white

? : symbol - white, background - black

big region(province) - hieroglyph,
little region - first letter:

Yunnan -
A - Kunming
L - Dali
R - Shangrila

Tibet -
A - Lhasa
B - far east
G - near east
C - near Lhasa
D - near west
E - north

Qinghai -
A - Sinin
H - Germu

Gansu -
A - Lanzhou
F - west region

Xinjian -
A - Urumqi
B - near Urumqi
C - to the west
G - more to the west
F - and more
L - far east
K - near east

Beijing -
Tianjin -
Shansi -
Shanxi -
Heilongjiang -
Zhejiang -
Fujiang -
Guandun -
Sichuan -
Ningxia -

China
Embassies and Consulates
Road distance
Photo from China