In 2011 the National Parks Board and the Land Transport Authority announced a plan to construct an ecological corridor, the Eco-Link@BKE, at the Bukit Timah Expressway to connect Bukit Timah Nature Reserve with the nearby Central Catchment Nature Reserve. Construction was completed in late 2013. The Eco-Link is an hourglass shaped bridge passing over the expressway, permitting wildlife to pass between the two reserves. Trees and shrubs native to Singapore are planted along the bridge, which provide food for the animals. The reserves had been separated since the expressway was built. After monitoring its effectiveness for a few years, the National Parks Board intends to consider opening the bridge to the public for guided walks.