The A1142 was a short link road in Bury St Edmunds town centre. Unclassified for many years, the road gained its number in the latter part of the 20th century to allow traffic to skirt the northern edge of the town centre. However, later bypasses mean the road is unclassified again and partially pedestrianised.
The road started as the A45 turned right from Brentgovel Street into Cornhill; the A1142 continued straight ahead along the remainder of Brentgovel Street before running into Looms Lane. The road ended at the far end at a T-junction on the A134 Northgate Street