Guide signs inform and advise road users about the direction and distances of destinations on the route they are following, or along other roads which intersect their route. They also supply information to identify points of geographical or historical interest and give directions to motorists’ services and tourist facilities and attractions.

The sub-classifications and the prefix and series number relevant to each are as follows:

G1 – Advance Direction Series
G2 – Intersection Direction Series
G3 – Finger Boards

G4 – Reassurance Direction Series
G5 – Street Name and Community Facility Series
G6 – Geographical Feature Series
G7 – Service Series 
G8 – Route Markers
G9 – Traffic Instruction Series
G10 – Kilometre Posts
G11 – Tourist Series
G12 – Overdimensional Load Route Series
GE – Freeway Guide Series

NOTE: The prefix S is used to identify symbols for use on G7 series signs.