The county council last week completed the first of the five upgrade schemes, at the junction between Garstang Road, North Road and Moor Lane.
The Local Democracy Reporting Service, external said this is currently expected to be the most expensive of the projects, with an anticipated final bill of £300,000.
On the A59, at the junction of Ringway, Church Street and Stanley Street – close to Preston Prison – replacement work is set to begin on 2 March with an estimated cost of £260,000.
The remaining three projects are all back on the Garstang Road section of the A6.
At the crossroads where the route meets St George’s Road and Aqueduct Street, the upgrade is scheduled to begin on 3 March and highways officials have estimated it will cost £120,000.
The installation of new signals at Garstang Road’s more sprawling junction with Blackpool Road, close to Moor Park, has a budget £250,000, while it is expected the improvements at the busy intersection with Black Bull Lane and Sharoe Green Lane will come with £210,000 price tag.
A start date is yet to be announced for either of the latter two schemes.