Ramsgate’s Royal Harbour Approach tunnel which goes to the artificial beach and port will remain closed up until April 21 for works to be carried out.
The tunnel has been shut since April 6 to enable fire hose pump repairs to be carried out by Kent County Council.
The closure means traffic, including trucks going to and from the port and Brett Aggregates at Berth 4 have to travel down Paragon Promenade and Royal Parade and along Military Road which is occupied by numerous businesses including bars and restaurants.
Disgruntled café customer Nick Jones tweeted: “Thanks @KentHighways , it’s so lovely having a peaceful coffee with lorry’s chugging out fumes.”
The 760 metre tunnel first opened in June 2000.