The next few images show many places where the knotweed is breaking through into the fabric of the car park.
The plant will grow rapidly, exploring and exploiting structural weakness in buildings and their fabrics, causing ever-increasing damage and rendering it very diffficult to eradicate.
It will(let alone "may")grow thus from beneath even a building's foundations.
All images are for sale; copyright belongs to Shaun Reeder and Doverow Studios. Enquiries, please, to shaunreeder@doverow.com