List of auxiliary NTHS Expressways

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National Trunk Highway System
NTHS expressway marker
NTHS expressway in China
System information
Formed	13 January 2005; 19 years ago (2005-01-13)
Highway names
NTHS:	GXXXX (green)
System links
National Trunk Highway System Primary Auxiliary

This is a combined list of the Spur (联络线), Parallel (并行线), Metropolitan Area Ring (都市圈环线) and City Ring (城市环线) routes of National Trunk Highway System Expressways of China. Auxiliary expressways are followed by two additional digits of their primary expressway and the GXX0X series routes are city beltways. Generally, odd-numbered routes have lower numbers in the east and higher numbers in the west; even-numbered routes have lower numbers in the north and higher numbers in the south.

Before 2017, those codes were followed by a cardinal point (N, S, E, W) and an additional digit if repeated starting with 2; associated auxiliary expressways were followed by two additional digits, but during the 13th National People's Congress in 2017, the SAC published a new recommendation national standard GB/T 917-2017, in this standard document, all auxiliary routes are ruled only having two additional digits, and therefore all parallel routes and most of city ring routes are having their codes changed.^[1]

China contains large groups of areas that are sparsely populated; expressways in these areas are therefore usually not designated principals, except when connecting provincial capitals with Beijing (G6, G7) or part of the Eurasian Land Bridge (G30, also the more practical route for Xinjiang to connect with Central and Southern China). However, in plans for 2035 all prefecture-level capitals and an absolute majority of counties must connect to the NTHS network, even in those remote areas, resulting in extremely long branch expressways (spur routes) of the NTHS, including but not limited to G0611, G0612, G0613, G0615, G1013, G1816, G5511. They likely will exceed 1,000 (2,000 for G0612 and G0613) km when completed, while the longest branch Interstate does not exceed 250 km. The G4218 is estimated at 4,000 km and will be the longest spur route in the world when completed.

In this list under Number column, the gray colored routes are not yet completed. The routes are officially printed in the 2022 National Highway Network Plan.^[2]