The Strategic Route Map shows:

*	The 3 north-south routes (Routes 1, 2 and 3) pass through the 3 cross harbour tunnels, and their numbering sequence follows the opening of the three cross harbour tunnels (i.e. Cross Harbour Tunnel, Eastern Harbour Crossing and Western Harbour Crossing);
*	The five east-west routes (Routes 4, 5, 7, 8 and 10) have sequences starting from south to north;
*	The circular Route 9 circumscribes the New Territories.

The individual Route Diagrams shows:

*	The exit numbers and their associated designations along the routes.

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Example on the use of diagrams:
Suppose your journey is from Yau Ma Tei to the Airport.
1.	Using the Strategic Route Map, identify that you need to travel via Route 3 and Route 8.
2.	Using the Route Diagrams (in this example, diagrams for Route 3 and Route 8), identify that you need to exit from Route 3 at Exit no. 5 to Route 8 and travel toward the airport.
3.	Just remember 3 - 5 - 8 (Route 3, Exit 5 then Route 8) during journey and note these numbers shown on directional signs.