The A2101 is one of two A-roads heading into Hastings from the north, being an alternative to the A21.
The road starts at a mini-roundabout on the A21 (former A28) in the northern suburb of Hollington. It heads east across Old Roar Gill on St Helen's Road before heading southwards along the valley. The road is lined with houses on the left but skirts the park on the right.
The park becomes the more formal Alexandra Park which leads to a roundabout and a bridge under the Marshlink Line. Now called Queen's Road, with buildings on both sides, the road reaches traffic lights where, according to some maps, the A21 ends. The A2102 passes the Priory Meadow shopping centre before bearing left into Albert Road and descending towards the sea. It ends at traffic lights on the A259 coast road on the edge of the beach.