N1 highway (Philippines)

Bulacan

The high soon enters Bulacan, at San Miguel, where it begins on a straight route, and becomes known as Doña Remedios Trinidad Highway. N1 then enters the poblacion of San Miguel, which it bypasses, and the highway begins to curve through most of its length between San Ildefonso and San Rafael, where the route runs through rice paddies. N1 closely follows a transmission corridor between the San Miguel-San Ildefonso boundary and San Rafael, and a Meralco subtransmission line uses the highway on that portion. Plaridel Bypass Road intersects with Doña Remedios Trinidad Highway just before approaching the poblacion of San Rafael. The highway curves to the southwest near Baliuag, where the old Cagayan Valley Road enters Baliuag. The highway serves as a bypass of Baliuag, with a flyover built on the intersection with another national road leading to Candaba. A Meralco subtransmission line follows the highway again up to Pulilan, where it leaves to follow Pulilan Bypass and Pulilan Regional Road. At Pulilan, it serves as a principal route through the town center. At Guiguinto, it crosses the North Luzon Expressway (NLEX) along with an interchange. It soon crosses the original route of NLEX at barangay Tabang, where it also crosses the Philippine National Railways right of way. N1 begins to follow MacArthur Highway, which serves as a major toll-free highway over southern Bulacan. It soon enters Balagtas, where it directly passes through its poblacion. The highway soon crosses the Bigaa River, where it passes through residential and industrial areas, and curves upon entrying Bocaue, where it bypasses the town center. A flyover restricted for use by light vehicles crosses Governor F. Halili Avenue to Santa Maria, and service roads serve as frontage and heavy vehicle routes. N1 then curves, then, runs through the residential barangays of Bocaue and soon enters Marilao.

Valenzuela to Pasay

Entering Metro Manila, the highway follows MacArthur Highway over Valenzuela, Philippines, which runs on a four to six-lane highway up to the Bonifacio Monument in Caloocan. N1 then turns left to follow the whole EDSA to Pasay. The whole road is notorious for congestion which cause delays as well as economic losses in the metropolis. EDSA runs through the central business districts of Metro Manila, most notably Araneta Center, Ortigas Center, and Makati Central Business District. The MRT Line 3 and the LRT Line 1 extension utilizes the center island of EDSA on most segments between Caloocan and Pasay. N1 ends below the EDSA Flyover in Pasay. A 19-kilometer (12 mi) gap in the highway is filled by the South Luzon Expressway and Skyway between Makati and Muntinlupa

Muntinlupa

N1 starts again below the Alabang Viaduct in Alabang, Muntinlupa, where it intersects with South Luzon Expressway (SLEX/E2/AH26), Alabang–Zapote Road, and Montillano Street (N142). The highway assumes the name Maharlika Highway, or locally, National Road. It runs as a commercial artery through the city until the boundary with Laguna in San Pedro over the Tunasan River.

San Pedro-Calamba

N1 generally serves as a four-lane toll-free highway serving the suburban cities of northwestern Laguna alongside the toll South Luzon Expressway. Most sections of N1 between San Pedro and Calamba serve as commercial streets. It is mostly lined by high voltage sub-transmission lines owned by Meralco, which are placed along the highway for economic and accessibility reasons. Except for a bridge in San Pedro which has not been widened, most of N1 is four lane with a painted median divider.

It enters Laguna in San Pedro, where it serves as a major commercial street, with a maximum of 4 lanes. At Biñan, it intersects N65 in a traffic light intersection west of the poblacion.