HK roads will be overloaded if structure is built for vehicles only, he says A rail line should be built on the proposed bridge linking Hong Kong, Zhuhai and Macau, according to a government adviser on Hong Kong's development over the next 30 years. The bridge, and line, should also link with the national railway network, giving Hong Kong access to every corner of the country, he said. Hung Wing-tat, an associate professor of civil and structural engineering at Polytechnic University who advised the government on the Hong Kong 2030 study, said roads in Hong Kong would quickly be overloaded with mainland traffic if the bridge was built solely for vehicles. He said the rail link on the bridge should also connect with the Pearl River Delta rail network at Zhuhai as the mainland would be building the Intercity Rapid Transit System to link cities in the region. Hong Kong already tops the world's most crowded road network list, with an average of 286.7 vehicles on every kilometre. It also ranks second on the list of most used road networks, with 5.9 million vehicles passing through every kilometre each year. 'The roads of the city wouldn't have the extra capacity to handle the mainland traffic,' Dr Hung said. 'And we should not encourage mainland vehicles driving here by having a vehicle-only highway between Hong Kong and Zhuhai.' He said accidents could increase along with the rise in cross-border traffic, with Hong Kong and the mainland driving on different sides of the road. 'Habit and different attitudes to driving will bring plenty of traffic accidents. There isn't any place in the world that has a huge number of vehicles with driving seats on a different side, not even London and Paris which are linked by the Channel Tunnel,' he said. Dr Hung said the Channel Tunnel was designed to encourage the use of a rail link. 'No one can drive through the tunnel ... Drivers have to park their cars and let the train carry them through the tunnel. By doing this, the tunnel actually encourages people to go by rail instead of driving. 'But, with the proposed bridge with vehicles driving across to the other side, there isn't any time for drivers to adjust themselves. It will be very dangerous.' He also warned that all the efforts made by Hong Kong to clean up its air would be in vain as mainland vehicles use diesel and Hong Kong could not control this. Dr Hung's comments came after Kowloon-Canton Railway Corporation chairman Michael Tien Puk-sun proposed in November that a $20 billion railway should be built along the proposed bridge. The executive director of the One Country Two Systems Research Centre, Siu Sin-por, also favours having a railway on the bridge because it could handle a larger passenger flow. Leo Leung Kwok-kee, executive director of Hopewell Highway Infrastructure, which is a strong proponent of the bridge project, said the rail proposal was not viable because of the lack of a huge traffic flow. Dr Hung also said Hong Kong should have a proper intercity rail terminal.