 Bypasses such as the Inner City Bypass, Airport Link and Clem Jones Tunnel are intended to help to circulate traffic away from the inner-city areas and main roads via limited-access roads above the ground, and tunnels below that have higher speed limits and exits to particular suburbs.Existing high speed cross-suburban motorways such as the Western Freeway, Centenary Freeway, Pacific Motorway and Gateway Motorway provide alternative routes to main roads and connect up to main highways and other arterial roads.The TransApex plan tunnels, Airport Link tunnel and Clem Jones Tunnel, Legacy Way tunnel and East-West Link tunnel are designed to link all the various motorways in Brisbane together.