Answer:
When lockdowns were imposed in March due to the COVID-19 pandemic, Filipinos saw possibly one of the most bizarre things that could happen in Metro Manila: decongested roads cleared, no unending lines of vehicles, cleaner air and no sound pollution echoing through virtually every corner of the metropolis.
According to the ADB, congestion happens when the capacity of the transportation network cannot meet the travel demand at a particular time. In Metro Manila, there are 5 circumferential roads and 10 radial roads that serve as major thoroughfares. You may know them as the C and R roads (e.g. C5, R1).
