This station ceiling is above ground - about the height of a 10-storey HDB (Housing Development Board) block, the highest elevated station along the MRT network. There are two reasons for the height. First, the 7.5 km, $3.5 billion extension goes over the Ayer Rajah Expressway viaduct at the Pan-Island Expressway interchange. Second, a 4.8 km portion of the line is being integrated with a road viaduct, which runs below the rail line.