Dinalupihan to Abucay

Section of Roman Superhighway in Abucay.

The highway starts at Layac, Dinalupihan at a t-junction with the Jose Abad Santos Avenue (Olongapo-Gapan Road). A short section of the highway from Layac Junction to Layac Bridge was formerly a two lane-road, with the said bridge had two lanes before widening into four lanes after passing Layac Bridge until 2015. The road turns westward and pass on Palihan Bridges 1 and 2 and between them are rice fields, with this section formerly had lower elevation before the construction of a higher road from 2009 to 2010. The level of the highway will become lower after passing these two bridges. An entrance of Subic-Clark-Tarlac Expressway (SCTEX) can be seen on this area. The road continues straightforward, passing through Hermosa Ecozone Industrial Park, and turns eastward upon paralleling with the Bataan National Road. The highway then passes through residential areas of Hermosa, Bataan before it turns westward and continues on a straight direction. It then passes Mambog Bridge and after passing the said bridge is Beverly Heights V and it will turn eastward and continues on a straight route until it reaches Dona Bridge, where the highway enters Orani. It will cross to San Pedro Street, pass through Dona Elementary School, and continues northbound until it intersects Governor Pascual Avenue, with left going to Orani town proper and right going to Sinagtala and Mount Santa Rosa through Binutas Trail. An office of Department of Public Works and Highways (DPWH) - Bataan 1st District can be found on this portion. After it is Orani Bridge 1. It enters Samal through the Orani Bridge 2. The highway continues on a straight direction and crosses the Samal River through Samal Bridge. A few meters away after the bridge is an entrance to Bataan 2020 and Charoen Pokphand Foods Philippines Corporation. It turns westward after passing Bataan 2020, continues to Barangay Gugo, enters Abucay through Calaguiman Bridge, and continues on a straight direction. Between Ray Hill Bridge is Mabatang Vicinial Road which is a road leading to Barangay Mabatang proper. A subdivision named St. Leonard Homes can be seen after the said bridge. The Mabatang Bridge is located after the subdivision. It continues northbound, passing through Calaylayan Bridge, and turns eastward. It then passes through Calaylayan Bridge. A few distance from the bridge is the Petron gasoline station. It follows a straight route and before entering Balanga, the Gerry's Grill restaurant and Toyota Bataan can be found. The highway then passes Tuyo Bridge and upon passing the former location of Balanga welcome sign which was removed due to the highway's widening after the said bridge, it enters Balanga.

Balanga to Mariveles

Section of Roman Superhighway traversing Barangay Bagong Silang in Balanga

After passing the former location of Balanga welcome marker, a Camella Homes subdivision can be seen at this portion. The road continues on a straight direction, intersects with Tuyo Vicinal Road, and passing through Penelco main headquarters. A four-lane road named Enrique Garcia Sr. Avenue (named after the Bataan former governor) is located near Penelco headquarters. Pass the four-lane road is Tenejero Bridge. The National Food Authority (NFA) Bataan can be seen after the bridge. It then passes through barangays Munting Batangas where the road turns westward, Camacho, Tenejero after the Tenejero 2 Bridge, Bagong Silang, Cataning, Cupang Proper, and Central. Various schools and malls can be found along the Balanga portion of the highway such as the Bataan National High School, Bataan Heroes College, Vista Mall Bataan, and Waltermart Balanga.

After Barangay Central, it enters Pilar through Talisay Bridge. It passes mostly on rice paddies within the municipality but on Barangay Alauli, there is an intersection of the highway, the under-construction Alauli Flyover, and Governor J.J. Linao Road. Various establishments can be found near the intersection, such as the Total gas station. It turns westward and enters Orion through Campot Bridge. It continues northbound and passes through various barangay within Orion. Between Daan Pare and Puting Buhangin exits, the highway and Bataan National Road intersects temporarily. The highway enters Limay and will pass on some subdivisions such as Trivea Residences. It continues on a straight direction and turns eastward, passing to Mamala and T. Kaliwa Bridges, with Petron Limay station between them. It then passes to Limay Overpass and the entrances of Emerald Coast Executive Village are found on both sides of the highway a few meters after the said overpass. The road turns westward and eastward, then it will pass on a terminus of Bataan National Road. After the terminus of Bataan National Road is Alangan Bridge. It turns eastward and westward, continuing on a straight route, then passes with Petron Bataan Refinery, SMC Consolidated Power Plant, Ayam Bridge, Orica Philippines, Inc., and Lamao Bridge.

The highway then enters Mariveles after passing the Lamao Bridge. It passes through barangays Batangas II (a Philippine National Oil Company (PNOC) plant and PPDC Park can be seen within the barangay), Lucanin, Cabcaben (where the highway parallels with Old National Road), Mt. View (where the Old National Road ends and Blessed Regina Protmann Catholic School (BRPCS) is located), and Alasasin. It continues to Baseco Country through Freeport Area of Bataan (FAB) checkpoint where the Mariveles substation of National Grid Corporation of the Philippines (NGCP) and Mariveles Coal-Fired Power Plant are visible from the highway and a bypass road going to Sisiman is located. The highway then passes the Zigzag Road. After Zigzag Road, it passes through FAB compound, Death March marker upon exiting the FAB compound, Jollibee Mariveles, Mariveles Municipal Hall, and the highway ends at Mariveles Bridge.