Cities along the road are Rauma, Pori, Kristinestad, Närpes, Vaasa, Nykarleby, Kokkola and Raahe.

Although running along the coast of the Gulf of Bothnia, it is not a scenic coastal road: the only views of the sea are when the road crosses the mouth of Kyrönjoki river in Vassor, Korsholm and Oravaisfjärden, Oravais (Finnish: Oravaistenlahti, Oravainen).

The road goes through the following municipalities: Turku – Raisio – Masku – Nousiainen – Mynämäki – Laitila – Pyhäranta – Rauma – Eurajoki – Luvia – Pori – Merikarvia – Kristinestad – Närpes – Malax – Korsholm (south) – Vaasa – Korsholm (north) – Vörå – Nykarleby – Pedersöre – Kronoby – Kokkola – Kalajoki – Pyhäjoki – Raahe – Siikajoki – Lumijoki – Liminka.

In Vaasa and Korsholm, the road (as Porintie) merges with the Vaasa-Helsingby motorway in Vikby, continues along this road to a motorway exit into Yhdystie, which bypasses Vaasa city center from east, and again through an exit to the right (east) as Kokkolantie into Kokkola and beyond.

A notable bypass is that of Nykarleby and Jakobstad, which lie some 9–10 km north of the road.