The Black Road was constructed in the summer of 1942 and connected the Treblinka I Labour Camp with the Treblinka II Extermination Camp. A special group, known as Wegebau, was formed from prisoners of the Treblinka I Labour Camp; it consisted of a dozen or so Polish road pavers and approximately 100 Jews as assistants [1]. The road was built, among other materials, from stones supplied by farmers as part of compulsory quotas. Jewish tombstones (matzevot) taken from Jewish cemeteries were also used in its construction. After the work was completed, the group was reduced in number and assigned to maintaining internal roads within the camp. A substantial section of the road with its original cobbled surface has survived to this day.
References
[1] Chodźko, Mieczysław, Ucieczka z Treblinki, Montreal 2004, p. 3