The Last Generation climate group members have blocked traffic in several parts of Berlin for the second day in a row.
The protest is part of a new wave of open-ended protests to call for an end to fossil fuels.
As of Tuesday morning, traffic was disrupted in 10 different locations, police said.
Up to 500 officers have been deployed to deal with the blockades.
Police took to the social media platform X, formerly Twitter, to appeal to drivers to remain calm and not intervene on their own.
Last Generation said on Monday that there were at least 23 sit-ins across the German capital.
In some areas, activists glued themselves to the tarmac, police said.
The group is demanding an end to fossil fuel use by 2030.
Currently, the government in Berlin plans for the German economy to become climate-neutral by 2045.
(dpa/NAN)
