A second free passage through the Western Harbour Tunnel may be cancelled after last Sunday's traffic chaos.
The Transport Department admitted yesterday another toll-free day to publicise the tunnel on May 18 might cause similar havoc unless more measures were taken to manage vehicles.
Traffic piled up on Gloucester and Connaught roads as thousands of drivers and taxi passengers crossed town to take advantage of the free harbour crossing.
The crush reached a peak between 3 pm and 5 pm when about 8,000 vehicles per hour were passing through the tunnel, only 500 short of its maximum capacity.
A department spokesman said officials would meet police and the tunnel's management tomorrow to discuss the promotion.