"Tar strips" typically refers to the black, sticky lines or patches that are present on roads. These strips are made of tar or asphalt and are used to repair or seal cracks in the pavement. Full definition
In fact, we found the SE tended to pound over tar strips at low speeds, making it the model we'd least recommend. (kbb.com)
Particularly at low speeds on a road with tar strips and poorly repaired potholes, the SC's ride was stiff, jolting and annoying. (articles.orlandosentinel.com)
With the standard Agility Control suspension — steel springs and variable damping — the ride is a bit firm, in that you notice minor road irregularities such as tar strips and expansion joints, though they aren't particularly jarring. (driving.ca)