Major building work on a Surrey hospital's new £22m emergency department, day surgery unit and helipad gets under way next week.
Hoarding around the site at Frimley Park Hospital will go up on Monday, when a new access road for ambulances and other vehicles will also open.
Building work will continue for the next year during which time the current A&E department will operate as normal.
The main entrance to the hospital for patients and visitors will not change.
However, during the work, for safety reasons, entrance B will remain closed and public pedestrian access to the hospital site from Gilbert Road will also close.
Members of the public have also been urged to follow all parking and dropping off guidance, while people on foot have been urged to look out for signs redirecting pedestrian access.