[1] This road is dangerous, and has tunnels along the way which used to be intended for rail services from Aringay to Baguio.

Recently, due to Marcos Highway suffering heavy traffic, the road was rehabilitated to serve as an alternative route down to La Union, but there are some more adjustments left.

The Anduyan Bridge, which spans 360 meters (1,180 ft), carries along the route.

After crossing the span, the road is narrowed to two lanes (one per direction) upon traversing the higher elevation that contains sharp curves and steep elevation upon entering Benguet province.

Some intersections are also marked by their relative distance from Baguio's kilometer zero, located in the city's Plaza Garden.