The A2028 was allocated to the former A21 north of Sevenoaks after the town's bypass was built.
The northern end of the road was at a GSJ near Morants Court, where the A21 turned onto its new route. The southbound A2028 followed the old route of that road whilst the northbound route followed what had been the B2211 alongside the new road before bearing left with the B2211 continuing ahead. The two sections met in Dunton Green before the road continued south to Riverhead where it crossed the A25.
Continuing on, the road passed Sevenoaks station before running into town along London Road. It ended on the A225 High Street; that road then continued south along the old A21.
Following the construction of the M25, which took on part of the A21 bypass, the A2028 was renumbered as an extension of the A224. The old GSJ on the A21 was closed and the southbound sliproad declassified.
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