Hello jonrellim,
The section of Tieker Damm which is parallel to the street Dubbeleweg is closed for cyclists. The reason is that Tieker Damm is only about a meter wide at this section. At both ends of this section road signs and markings on the road direct cyclists to drive on Dubbeleweg instead of Tieker Damm. This was changed recently (last 2 years). Before the change this section of Tieker Damm was open to cyclists. 