Heritage roads in Singapore

The Heritage Roads scheme was implemented in 2001 by the Singapore government to identify and protect roads whereby there are lush road-side trees, often so dense that they create "green walls" and even "green tunnels". Concerns that rapid urban development will result in the removal of these trees especially due to the widening or realignment of these roads, the authorities identified 5 roads from a list of 55 suggested by the National Parks Board. The remaining roads were placed on a watchlist to be closely monitored, and may be added to the scheme later.

...
Wikipedia