Historically, before the advent of the A55 North Wales Expressway, the A5122 was part of the A5 London to Holyhead road as far as Menai Bridge and then the A487 (former A4087) back to the A5. With the opening of the extension of the A55 to Holyhead in 2001, the A5 was rerouted to its original route through Bangor and over the Menai Suspension Bridge - and the A487 was extended back to meet it - leaving the A5122 number defunct. The A55 took over as the main route to Holyhead bypassing Bangor, and via the Britannia Bridge.
Prior to this, the A5122 had existed as a very short link along Farrar Street in Bangor itself. It is not clear whether the two routes co-existed or not, as no number can be identified for Farrar Road once the A5122 was rerouted.
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