West Sussex County Council will be inspecting three bridges in East Grinstead at night.
The routine inspections will make sure all three structures are safe, and identify any defects to repair.
The bridges being inspected are: College Lane, London Road and London Road footbridge.
Work starts on Monday October 19 and is scheduled for seven nights.
Working hours are between 8pm and 6am.
The A22 Beeching Way, which runs underneath, will be closed overnight during this time.
The closure will be in place between Lewes Road roundabout and London Road, where the A22 forks into two.
The work is scheduled at night to prevent tailbacks during the day.
All three bridges will stay open throughout the work.
Traffic will be diverted along: Lewes Road (B2110); College Lane (B2110); A264; A22; London Road; and High Street.
The closure will not affect the traffic diversion already in place for the East Grinstead bus station improvements.
John O’Brien, county council cabinet member for highways and transport, said: “These inspections are essential and are done periodically to check our bridges are safe.
“By scheduling them overnight, we can minimise traffic disruption during the day.”