Frozen food giant Iceland is creating 240 jobs at its depot in Flintshire.
The supermarket, which created 100 jobs last year at the Deeside site working in chilled foods, will use the new roles for frozen food distribution.
Iceland is one of the largest companies in Wales and hopes the depot will become a regional distribution centre for 100 stores handling all food types.
But it has called on authorities to improve access to the site where it is based.
A spokesman added: "We very much hope that the Welsh Government and Flintshire council will support us in this by taking urgent action to alleviate the acute problems of access to and from Deeside Industrial Park that are being caused by traffic congestion and a shortage of parking provision."
Last week Iceland announced it will become the first in Wales to give cash tokens to shoppers who return plastic bottles.