Governor Aswin Kwanmuang told reporters on Tuesday that the tunnel linking Sanam Luang and the Grand Palace on Maharaj Road is almost ready to be officially inaugurated.
He said that apart from allowing people to cross the road safely, there are washrooms and spaces for them to wait for their friends.
The tunnel also has a museum zone that exhibits the history of Bangkok when it was the ancient capital of Rattanakosin and how architectural styles have changed. Also on display are images of the Inthorn Rangsan Fort and ancient city walls.
The governor said the tunnel can accommodate up to 600 people at any given time and expects some 10,000 people to use it daily.
Aswin said the tunnel is 99 per cent ready, pending last-minute finishing touches and cleaning.
He added that by July this year, a lift will be added at each end of the tunnel.