The southern portion (Hwy 100), is a four-lane divided highway that makes up the bypass route of the Trans-Canada Highway, and is heavily travelled.
Much of it has been upgraded to freeway standards, but there remain several at-grade signalized intersections.
The northern portion (Hwy 101), is a mix of two-lane and four-lane divided highway, with a most intersections being grade-separated.
There are 6 Circumferential Roads in the Metro Manila area of the Philippines.
See Major roads in Metro Manila.