The route starts on the north side of the town at a mini-roundabout on the B1255, immediately east of a larger roundabout junction where that road meets the A165. It descends through the Old Town, running south-east and south along Scarborough Road, St John's Street, and Quay Road. After nearly three quarters of a mile we reach a roundabout junction with Station Road – which runs due south and bridges the railway line. To access the station itself, however, we need to remain on the B1423 and, after passing the imposing Bridlington Town Hall, turn right, just beyond a level crossing, into Station Approach. A further 70 yards then brings us to a light-controlled crossroads where the B1423 turns right Springfield Avenue to head down to the route's terminus on the B1254 Hilderthorpe Road.
The B1423 was, for a long time, the A1038, until in the early 2010s that number was re-allocated to the former route of the A165 through Bridlington via Kingsway and Bessingby Road. The old A1038, or most of it, was at the same time reclassified as the B1423 – the one change to the old route being that at its eastern end it was diverted to cut through Springfield Avenue instead of continuing to the far end of Quay Road. These changes were not, however, recorded by many maps before the late 2010s.