The gate, which is the best preserved Roman gateway in the country, was built c. AD 70-96. The gatehouse, which originally had two main arched passageways with separate arched footways on both sides, has largely disappeared. The remaining gateway which we see today is the south-side arched footway; however the remains of a guard tower are also visible.
The gate consisted of two broad carriageways, each 17 ft (5.2 m) wide, flanked by two footways, each about 6 ft (1.8 m) wide. The whole gate projects 30 ft (9.1 m) in front of the town wall, and the total extent of the frontage is 107 ft (33 m)

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