Around 160 cyclists from various countries are taking part in the five-stage 740-kilometre-long race, which started in the central town of Pabianice on Wednesday.
The second leg of the annual race saw cyclists cover a 97 km route starting in the town of Kutno and ending in Płock, a mid-sized city some 100 km northwest of the Polish capital Warsaw.
Polish rider Patryk Stanosz won the first leg of the race, which was 75 km long and ended in Łódź, Poland's third-largest city.
The remaining stages of the 32nd Solidarity Race, which is also known as the Course de Solidarność et des Champions Olympique, will take riders through a number of other small towns and mid-sized cities in central and southeastern Poland.
These include Koluszki, Sieradz, Tomaszów Mazowiecki, Kielce and Ostrowiec Świętokrzyski.
The race will end in Stalowa Wola in the southeast of the country on Saturday.
Polish rider Stanisław Aniołkowski won last year's Solidarity Race, which has been held annually since 1990.
Poland will later this year be hosting its largest cycling race, the Tour de Pologne, due to take place from August 9 to 15.
(gs/pk)
Source: IAR, PAP, wyscig.com.pl