Santiago–Tuguegarao Road

Santiago–Tuguegarao Road is a major national primary road in the provinces of Cagayan,^[1] Kalinga, and Isabela^[2][3] in the Philippines. It is a bypass road of the Pan-Philippine Highway, also known as Cagayan Valley Road, connecting to the cities of Tuguegarao and Santiago.

Santiago–Tuguegarao Road
The Ramon, Isabela segment of the road, with Route 51 sign
Route information
Length	130 km (81 mi)
Component highways	N51
Major junctions
South end	AH 26 (N1) (Maharlika Highway) / R.C. Miranda Road in Mabini, Santiago
Major intersections	N224 (Banaue–Mayoyao–Alfonso Lista–Isabela Road) in Ramon, Isabela N53 (Santiago–Tuguegarao Bypass Road) in Cabatuan, Isabela N53 (Santiago–Tuguegarao Bypass Road) in Cabatuan, Isabela N220 (Cabagan–Santa Maria Road) in Santa Maria, Isabela N52 (Kalinga–Cagayan Road) in Enrile, Cagayan N106 (Tuguegarao Diversion Road II) in Buntun, Tuguegarao N107 (Tuguegarao Diversion Road I) in Ugac Sur, Tuguegarao N107 (Tuguegarao Diversion Road I) in Balzain East, Tuguegarao
North end	AH 26 (N1) (Cagayan Valley Road) / N106 (Tuguegarao Diversion Road II) in Tanza, Tuguegarao
Location
Country	Philippines
Provinces	Cagayan, Kalinga, Isabela
Major cities	Tuguegarao, Santiago
Towns	Ramon, San Mateo, Cabatuan, Aurora, San Manuel, Roxas, Mallig, Quezon, Rizal, Santa Maria, Enrile, Solana
Highway system
Roads in the Philippines Highways Expressways List
← N11 → N52

The road is designated as National Route 51 (N51) of the Philippine highway network.

History

Route description

Aerial view of Santiago–Tuguegarao Road in Cagayan, with the Buntun Bridge, which carries the road over the Cagayan River.

Santiago to Cabatuan

Santiago–Tuguegarao Road starts at Mabini Junction, a roundabout intersection with Maharlika Highway and R.C. Miranda Road in Barangay Mabini, Santiago City. Heading north, it then runs straight to the north where it traverses the municipalities of Ramon, San Mateo, and Cabatuan in Isabela.

Cabatuan to Santa Maria

At the poblacion of Cabatuan, the road turns north at its intersection with Santiago–Tuguegarao Bypass Road, where the Triangle Park is situated. It then crosses the Magat River vis Magat Bridge and traverses the municipalities of Aurora, San Manuel, Roxas, Mallig, and Quezon in Isabela before entering the province of Kalinga. In Kalinga, it traverses the lowland municipalities of Tabuk, the province's capital, and Rizal, away from their poblacions. It then re-enters Isabela and traverses the municipalities of Santo Tomas and Santa Maria.

Santa Maria to Tuguegarao

A section of the highway as Luna Street in Tuguegarao

In Santa Maria, Isabela, the road makes a sharp left turn at its intersection with Cabagan–Santa Maria Road. It then enters the province of Cagayan and traverses the municipalities of Enrile and Solana, where it turns east at its intersection with Cagayan–Apayao Road. It crosses the Cagayan River through the Buntun Bridge and enters the city of Tuguegarao. Approaching the poblacion, it assumes local street names such as Luna Extension and Luna Street, respectively. At its intersection with Rizal Street, west of the Tuguegarao Cathedral, it turns north and assumes such local street name. It then turns northeast towards the Balzain Bridge II and becomes Balzain Highway. The road ends at the Tuguegarao Junction, a roundabout intersection with Maharlika Highway (Cagayan Valley Road) and Tuguegarao Diversion Road II.

Intersections

Intersections are numbered by kilometer post, with Rizal Park in Manila designated as kilometer zero. 

Region	Province	City/Municipality	km	mi	Destinations	Notes
Cagayan Valley	Isabela	Santiago	327	203	AH 26 (N1) (Maharlika Highway) / R.C. Miranda Road	Southern terminus. Roundabout intersection.
		Ramon	340.5	211.6	Burgos–Aguinaldo Road
			341.8	212.4	N224 (Banaue–Mayoyao–Alfonso Lista–Isabela Road)
		San Mateo	350.9	218.0	Alicia–San Mateo Road
		Cabatuan	361.9	224.9	N53 (Santiago–Tuguegarao Bypass Road)	South end of bypass.
			363.3	225.7	N53 (Santiago–Tuguegarao Bypass Road)	North end of bypass.
		Roxas	382.6	237.7	Gamu–Roxas Road
		Mallig	392.7	244.0	Ilagan–Delfin Albano–Mallig Road
		Santa Maria	432	268	N220 (Cabagan–Santa Maria Road)
		Quezon	408.7	254.0	Abbut–Agbannawag Road
Cordillera Administrative Region	Kalinga	Rizal	419.6	260.7	Rizal National Road
Cagayan Valley	Isabela	Santa Maria			Cabagan–Santa Maria Road
	Cagayan	Enrile	437	272	N52 (Kalinga–Cagayan Road)
		Solana	452	281	Cagayan–Apayao Road
		Tuguegarao			N106 (Tuguegarao Diversion Road II)
					N107 (Tuguegarao Diversion Road I)	Locally known as College Avenue; south end of bypass
					Rizal Street	Road assumes the name Rizal Street.
					N107 (Tuguegarao Diversion Road I)	Locally known as College Avenue; north end of bypass. Road assumes the name Balzain Highway.
			456	283	AH 26 (N1) (Cagayan Valley Road) / N106 (Tuguegarao Diversion Road II)	Northern terminus. Roundabout intersection.
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Santiago–Tuguegarao Bypass Road

Santiago–Tuguegarao Bypass Road
Location	Cabatuan, Isabela
Length	2.275 km (1.414 mi)

The Santiago–Tuguegarao Bypass Road is short bypass of Santiago–Tuguegarao Road in Cabatuan, Isabela. This bypass road is designated as National Route 53 (N53) of the Philippine highway network. It connects Cabatuan, Luna and Cauayan.