The road begins in the Medway town of Rochester at the foot of Star Hill forming a junction with the A2 road. It then climbs up through the built-up area of Chatham, passing Troy Town and Rochester Airport before descending the slope of the North Downs at Blue Bell Hill. As it reaches the summit of the climb there is the first of two complicated series of junctions, this with the M2 motorway. Below the road as it descends is the tunnel carrying High Speed 1. Once into the Medway Valley the northern outskirts of Maidstone are reached; and a second series of junctions, this time with the M20 motorway are reached.
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