5-599: Santiago–Tuguegarao Road is a major national primary road in the provinces of Cagayan , Kalinga , and Isabela 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 . The road is designated as National Route 51 ( N51 ) of the Philippine highway network . Santiago–Tuguegarao Road starts at Mabini Junction,
10-581: 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. 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
15-486: 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 poblacion s. It then re-enters Isabela and traverses the municipalities of Santo Tomas and Santa Maria . In Santa Maria, Isabela,
20-754: 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 are numbered by kilometer post, with Rizal Park in Manila designated as kilometer zero . The Santiago–Tuguegarao Bypass Road
25-615: 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
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