This project includes the extension of the voivodship road No. 579 of the report: Kazuń Polski – Leszno – Błonie – Grodzisk Mazowiecki – Radziejowice on the section Radziejowice – Grodzisk Mazowiecki. The extension of the Voivodeship Road No. 579 covers the section from km 41 + 178 to km 51+ 599 excluding the section from km 41 + 321.95 to km 41 + 567.50. This excluded section will be covered by the project concerning the construction of the western bypass of Grodziska Mazowiecki. The investment will be located in Mazowieckie Voivodeship, Grodzisk County in Grodzisk Mazowiecki commune and in Żyrardów County in Radziejowice commune. The planned road runs along the existing footsteps of the Voivodeship Road. The planned investment of the extended road runs through built-up and unbuilt areas. Built-up areas include areas such as the following places: Radjowice, Klakówka Zarzeczna, Mościska, Kałęczyn, Grodzisk Mazowiecki. Part of the route runs through undeveloped areas, i.e. forests, meadows and fields. This project is planned to be co-financed under Measure 7.1 Road infrastructure, WM RPO for the years 2014-2020, in non-competitive mode. As part of the construction work, the following will be carried out: extension and reinforcement of the existing road pavement, reconstruction of one bridge facility, reconstruction and construction of new engineering facilities (passes) in adaptation to the road design, correction of non normative horizontal arches in the plan, correction of non normative longitudinal and vertical arches, construction of new road construction and extension of existing bus bays, extension and construction of pavements, construction of bicycle paths and walkways, The project will also include investor supervision, promotion, land purchase and study.