The A158 road is a major tourist route that heads from Lincoln in the west to Skegness on the east coast. The road is located entirely in the county of Lincolnshire and is single carriageway for almost its entirety. The road is approximately long. The road gets quite congested with holiday traffic during the summer.

Lincoln to Horncastle

The road begins outside Lincoln as part of the by-pass at the A46. It heads south east for until reaching a roundabout where the A15 joins from the centre of Lincoln. Ths was the original route before the bypass opened. From here the route heads north east through the village of North Greetwell then Sudbrooke where it crosses the Lincoln to Grimsby railway. Further on at Bullington the B1399 heads north east while the A158 changes direction and heads east to Wragby. Here it crosses the B1202 then forks with the A157 which heads through the Lincolnshire Wolds to Louth. From here the route gets quite twisty then heads south east around the south end of the Wolds. At Baumber the B1225 joins from the north as the A158 continues towards in a more southerly direction towards the town of Horncastle. The B1190 and B1191 both join just outside Horncastle where the road crosses the A153.

Horncastle to Skegness

After leaving Horncastle the route heads east with the B1195 heading off a few miles later to Spilsby. Further on the road passes through the large village of Hagworthingham. The road then reaches a roundabout with the A16 at Partney. Both roads used to go through Partney but now bypass it. The A158 continues east until reaching another roundabout with the A1028 which provides a short cut from the A16 further north. The B1196 also heads up to Alford from here. The A158 becomes dual-carriageway for a mile from here until becoming single again through Gunby. The road heads through Burgh le Marsh before finally reaching Skegness where it terminates at a junction with the A52.