Any of various thick, dark, sticky substances obtained from the distillation residue of coal tar, wood tar, or petroleum and used for waterproofing, roofing, caulking, and paving.

Wirtgen is a leader in making machines that recycle tar and grit from old roads to be relaid as smooth new ones, as is Leitz in making wood-processing tools.

The shelters appear as asymmetrical bodies with angled lines and are covered with large wood chips treated with black-pigmented wood tar oil.