The road starts at a roundabout at the western end of the A63 Selby bypass. It heads east through Thorpe Willoughby and then over a level crossing to another fast section into Selby. From here we slow down gradually to a crawl at any hour of day or night, as we run from the suburbs into the town centre. By the town hall we stop dead at traffic lights and meet the A19. The A1238 ends here, with the A19 continuing through town to the far end of the bypass.