Toll increases at two more tunnels are on the way after the government approved their applications for rises of up to 30 per cent. Government officials said yesterday the toll increases for the Tate's Cairn Tunnel and Tai Lam Tunnel were justified because one company had been losing money and the other had deferred a previous rise because of poor economic conditions in the city. Some legislators were shocked and angered by the announcement, saying officials had failed to respect a Legislative Council motion opposing a rise in the Tate's Cairn toll. A special meeting of the Legco transport panel will be held next week to discuss the toll rise. The toll at Tate's Cairn, also known as Tai Lo Shan, will rise on August 1 by between 5.9 per cent and 30 per cent, or $1 to $6, depending on the type of vehicle. The toll for private cars and taxis will rise from $10 to $12. Double-decker buses will see the biggest increase, from $20 to $26. The toll will be unchanged for motorcycles. The government estimates 2 per cent of the tunnel's daily traffic - about 1,200 vehicles - will take alternative routes, increasing traffic at Lion Rock Tunnel and on Tai Po Road. The May 1 Eastern Harbour Tunnel toll rise has seen thousands more vehicles use the less-expensive Cross-Harbour Tunnel. The Tate's Cairn increase was approved by the Executive Council on Tuesday. 'We know very well that an increase will affect public life, but we also need to strike a balance and attract investors to infrastructure projects,' acting Chief Executive Henry Tang Ying-yen said. Secretary for Environment, Transport and Works Sarah Liao Sau-tung added: 'Tate's Cairn Tunnel has been losing money for more than 10 years. After this increase, it will achieve an internal rate of return of only about 4 per cent. We find this to be reasonable. That's why it [the rise] did not go through arbitration.' For the Tai Lam Tunnel, part of Route Three that links Yuen Long with Kowloon, tolls will rise by between $3 and $15, a 12 per cent to 25 per cent increase, from June 19. The new toll for private cars and taxis will be $25, up from $22. The toll for motorcycles, and medium and heavy goods vehicles will remain the same at $17. Unlike Tate's Cairn, the Tai Lam Tunnel operator is allowed by law to adjust its toll based on the company's revenue. Still, lawmakers were upset they were not informed of the decision until yesterday. 'Even if they had a justifiable case for adjusting the toll they should have come to us to explain it,' said Miriam Lau Kin-yee, who represents the transport sector. Transport panel chairman Lau Kong-wah said he would ask government and tunnel officials to explain the increase. The city's three bus operators said they would not pass on the extra cost to passengers and had to cut costs and generate more revenue in other ways.