Merak – Cilegon – Serang – Tangerang – Jakarta – Bekasi – Tambun – Cikarang – Karawang – Klari – Kosambi – Dawuan – Cikampek – Sukamandi – Pamanukan – Kandanghaur – Lohbener – Jatibarang – Palimanan – Weru – Cirebon – Losari – Pejagan – Brebes – Tegal – Pemalang – Pekalongan – Batang – Weleri – Kendal – Semarang – Demak – Trengguli – Kudus – Pati – Rembang – Bulu – Tuban – Widang – Babat – Lamongan – Gresik – Surabaya – Waru – Sidoarjo – Porong – Gempol – Bangil – Pasuruan – Nguling – Probolinggo – Paiton – Besuki – Panarukan – Situbondo – Bajulmati – Ketapang Route 1 starts on the confluence of Route 19 and Jalan Raya Merak (an entry to Merak Ferry Terminal, also the last railway crossing of Tanah Abang-Merak railway line).

The route continues 6.5 km eastwards, crossing over Cengkareng Drain, Angke River, and Western railway line.

Pangeran Tubagus Angke marks the entrance of Route 1 into North Jakarta approximately one kilometer after crossing Ciliwung.

Martadinata, the route runs parallel with Harbour Toll Road, Ancol River, and Inner City Railway Line (Jakarta Kota to Tanjung Priok segment).

The Bekasi Regency section of Route 1 mostly goes eastwards for approximately 28 km, passing through the communities of Tambun, Cibitung, Cikarang, and Kedungwaringin.

Route 1 then turns southeastwards as Jl Tuparev and running for approximately 5 km before encountering a junction with Karawang Outer Ring Road.

A railway line connecting Cikampek and Prujakan Station in Cirebon stretches beneath the flyover carrying Route 1 adjacent with Jomin Junction.

Route 1 then runs for 14 km eastwards before crossing over an irrigation channel located near the coast of Java Sea in Kertawinangun.

The route heads for village of Kliwed in southeast direction as long as six kilometers, and then it turns southward for 6.5 km before going into Cirebon Regency.

Cisanggarung River is the western border of Central Java, from which Route 1 goes southeastward into Brebes Regency, adjacent with Northern railway line.

When passing Sambong Bridge 550 m later, it begins to enter a mountainous region that becomes a continuation of Dieng Plateau located in the south.

Route 1 winds through the subdistricts of Kandeman, Tulis, Subah, Banyuputih, and Gringsing, in which there are many warungs and restaurants founded to cater all long-distance travellers.

Continuing 32 km east, it encounters a three-way junction in Surodadi Village, where Route 1 goes eastward, while most traffic in North Coast of Java takes the newer road diverging from here.

Continuing four kilometers northward with a railway passing under it, Route 1 then turns eastward after crossing over Western Floodway (Banjir Kanal Barat).

Passing through the subdistricts of Mijen, Gajah, and Karanganyar, Route 1 reaches Kudus Regency after crossing over Serang River 13 km northeastward.

Most travellers not wishing to make a stop in Downtown Kudus follows the ring road as it avoids traffic jam around alun-alun located 4.5 km from the junction.

The route then continues 4.5 km eastward before intersecting with Kudus Outer Ring Road in Ngembalrejo Village.

It then curves to the southeast, and remained so until reaching East Java border twenty three kilometers later, after passing through the subdistricts of Kragan and Sarang.

Route 1 curves eastward, and runs parallel with Eastern railway line until entering Bangil, the seat of Pasuruan Regency, some 4.5 km later.

Route 1 begins to divide between east- and westbound segment in front of Pegadaian Building, Indonesian pawnshop service.

Eleven kilometers east of the rail crossing, Route 1 reaches Nguling Bridge, marking the entrance to Probolinggo Regency.

1.5 km from railway crossing, there is a three-way junction that has been a most-taken access toward Bromo Tengger Semeru National Park.

Before being aligned eastwards 22 km later, the route passes through the subdistricts of Gending, Pajarakan, Kraksaan (seat of Probolinggo Regency), and Paiton.

Upon exiting Paiton Generating Station some six kilometer later, the route enters Situbondo Regency, and begins to travel along the coast.

In Suboh, located 3.5 km east, the route intersects with a regional road leading for Bondowoso Regency.

In this segment, the route also passes near Pasir Putih Beach, that becomes a popular tourist destination in the Eastern salient of Java (Indonesian: Tapal Kuda).

After crossing over Sampeyan River, which becomes the eastern terminus of Great Post Road built by Daendels, the route reaches Downtown Situbondo seven kilometers eastward.

After passing through the subdistricts of Arjasa, Jangkar, Asembagus, and Banyuputih, the route enters Baluran National Park some 28 km southeast.

After intersecting with a road going into the national park, Route 1 goes into Banyuwangi Regency 450 m southward, marked by a bridge over Bajulmati River.

After running for 14 km southeastward, Route 1 approaches the coast of Bali Strait in Bangsring village, and remains so until reaching Ketapang nine kilometers southward.