Final answer:
The dark, viscous substance related to petroleum that is often used for road construction and roofing is tar.
Step-by-step explanation:
The dark, viscous substance often used for road construction and roofing that is related to petroleum is tar. Tar is a byproduct of oil refining and is derived from heavy hydrocarbon chains found in crude oil. It is a sticky and thick substance that has adhesive properties, which makes it suitable for road construction and roofing materials.