Raising Bartley Road involves topping it up with layer after layer of road construction material such as bitumen, and compacting each layer until the road reaches the desired elevation.
Asked why it did not design the new road to be of the same elevation as an existing busy thoroughfare – to minimise disruption to traffic – HDB said one reason was that Bidadari Park Drive also connects to Bartley Walk, a small road fronting Maris Stella High School, which is located on high ground and “cannot be lowered”.
Engineers said it was uncommon for an existing road’s elevation to be altered to match that of a new road. Usually, it is the other way around. “It might be because of flood mitigation, for instance,” said the engineer, who asked not to be named.Retired transport engineer Gopinath Menon said lowering the elevation of the new road might mean the flats next to it would become higher, creating slopes that “could be a waste of space”.
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