At Augst, the motorway splits, with the A2 branching off and the A3 continuing past Rheinfelden and Frick.
In Zurich the motorway ends and until the Uetliberg Tunel is completed in 2008, one must drive through the city.
The A3 represents (together with a section of the A1) the most important connection between Basel and Zurich, and (together with a section of the A13) the most important connection Zurich–Chur.
The motorway was widened to ten lanes between junctions 12 and 14, and twelve lanes between junctions 14 and 15, in November 2005.
While this is more a structural than a logical issue, at junction 5 near Sevenoaks continuing around the M25 requires the driver to follow the slip roads, as the main routes continue as either the M26 to the east (on to the M20) or the A21 towards the south coast.
The distance of the motorway from central London (taken as Charing Cross) varies from approximately 12 miles (20 km) near Potters Bar to 20 miles (32 km) near Byfleet.
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