To keep millions of people and thousands of container trucks on the move, highways, flyovers and tunnels have to be intertwined like blood vessels in hilly Hong Kong. Tuen Mun Road is far from being the only highway to have elevated sections snaking along hillsides and over stretches of water. The city has 11 major road tunnels, 1,029 flyovers and bridges, and 904 footbridges and pedestrian subways. The construction of Tuen Mun Road began in the 1970s. At the time, Tuen Mun was linked to the New Territories and Kowloon by two two-lane roads. Unlike Tsuen Wan and Sha Tin new towns, Tuen Mun was much farther away from urban Kowloon - nearly 25km. Back then, when traffic was a lot less heavy, the road from western Kowloon wound along the coast, twisting in and out of inlets, to minimise the need to dig cuttings through slopes. As the government started to develop Tuen Mun new town, Tuen Mun Road was built between Tsuen Wan and Tuen Mun. Its first sections opened in 1978. But as traffic increased the new road could not cope. It was extended and widened substantially between 1994 and 1996, with many more bridges and culverts built. Climbing lanes for Kowloon-bound traffic were added on hilly sections at Sam Shing Hui, So Kwun Wat and Ting Kau. The Siu Lam section was further widened, from a three-lane to a four-lane highway, The construction was completed in May 2001. The road remains one of the most heavily used in Hong Kong, and the government said yesterday further improvements were planned to improve traffic flow and safety.