Public outrage over the toll increase at the Eastern Harbour Tunnel has toppled the transport secretary from the top of the city's political popularity standings, according to a university poll. Secretary for Environment, Transport and Works Sarah Liao Sau-tung is no longer the most popular bureau chief, after her rating dropped nearly five points between mid-April and early this month, to 57.9 out of 100. The top rank now goes to Secretary for Security Ambrose Lee Siu-kwong, although his score also fell by 2.9 points, to 59.5. Dr Liao has topped the poll for much of the time since becoming transport chief in July 2002. The University of Hong Kong's Public Opinion Programme interviewed 1,024 people from Tuesday to Thursday last week, shortly after the toll rise for the Eastern Harbour Tunnel came into effect. Pollster Robert Chung Ting-yiu said Dr Liao suffered the biggest drop among the bureau chiefs, and attributed it to the toll increase. He believed the resulting traffic jams would continue to affect the minister's popularity. Dr Liao's press secretary said the government was aware of public grievances arising from the increase and that she would try her best to address concerns. Meanwhile, public approval for Donald Tsang Yam-kuen as chief executive continues to soar. The vote of confidence in him increased another five points, to a new high of 77 per cent, over the past three weeks. His personal popularity rating climbed back from 68.3 to 71.2 earlier this month. Constitutional Affairs Secretary Stephen Lam Sui-lung remains the most unpopular minister, with a rating of 44.4, trailing housing chief Michael Suen Ming-yeung's 48.2.