Expressway S12 or express road S12 (in Polish droga ekspresowa S12) is a Polish highway planned to run from a junction with the A1 highway near Piotrków Trybunalski to a border crossing with Ukraine at Dorohusk, passing by Radom, Lublin and Chełm. The completed road should be about 328 km long. As of 2024 the section open to traffic runs from Puławy through Lublin to Piaski. The expressway from Piaski to the border with Ukraine is under construction, set to be opened in early 2025 (the bypass of Chełm) and in early 2027.

Existing sections

Future

A document outlining the future development of transport infrastructure issued by the Polish government in December 2022 projects that the road would be fully completed in 2030, however the majority of the section from Lublin to Ukrainian border will be opened in years 2025 – 2027.