Expressway S1 or express road S1 is a Polish highway under construction with a planned length of , located in the Silesian Voivodeship. Upon completion, it will connect the A1 motorway near the Katowice International Airport in Pyrzowice with the border of Slovakia in Zwardoà Â, linking to the D3 motorway.
The route is expected to be completed in 2027.
The section from A1 motorway to A4 motorway and further to Tychy is open to traffic. It forms the eastern beltway of the Upper Silesian Industrial Region.
From Tychy to Bielsko-Biaà Âa, the existing dual-carriageway national road 1 serves the traffic. New parallel expressway route is under construction, planned to be finished in 2027.
From Bielsko-Biaà Âa to the Slovak border in Zwardoà Â, the expressway is completed. The section from à »ywiec to Zwardoà  is a single-carriageway expressway, with the exception of the 5-kilometer long fragment including two pairs of tunnels, which was already constructed in a dual-carriageway profile to avoid lost costs in case of adding the second carriageway in the future. At the border the road connects to the single-carriageway D3 motorway in Slovakia.
The S1 originally was routed from Bielsko-Biaà Âa via Cieszyn to the Czech border. This section was renumbered to Expressway S52 in 2016 and the S1 was rerouted over the former Expressway S69.
As of the end of May 2016 six options for the route were proposed. <div style="line-height:1.6;border:0.6px solid grey;"><div class="toccolours mw-collapsible mw-collapsed" style="overflow:auto;">Route variants<div class="mw-collapsible-content mw20-collapsed-content">
Five of them were already available by June 2008. At first option IV(D) was preferable. It would have gone parallel to Brzeszcze â Oà ÂwiÃÂcim railway tracks (PKP rail line 93). However, UNESCO protested against the choice, as, in their opinion, the traffic would have disrupted the zone of silence around the former German concentration camp Auschwitz-Birkenau, and, as the result, UNESCO would have put the camp onto the endangered list.
At the beginning of August 2009, the head of Miedà ºna county has announced to the media his option of the S1 (option VI), that would have gone through a forest on the borders of the Miedà ºna and Bojszowy county. In November 2009, it was accepted by all the local counties. However, GDDKiA turned down this option due to environmental issues. The road would have passed through the "Stawy w Brzeszczach" reserve for birds conservation, which was not acceptable.
Counties through which the road would have passed according to the option V:
Counties through which the road would have passed according to the option VI:
In 2013 a new option, presented by the mining companies "SILESIA" and "Brzeszcze" and by Miedà ºna, Brzeszcze and Bestwina counties, was proposed. The option "H"(or hybrid), as it is known, was an initial compromise between the companies and counties and GDDKiA. However it wasn't implemented.
The project was expected to cost approximately 1.437 bln zà Âotych.
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