Authors discovered wheel ruts in Cyrene, Sabratha, Leptis Magna which were city remains of the Roman Empire of north Africa till now. Recently, authors did an on-the-spot survey of Timgad that was city remains of Roman Empire. Timgad is situated in the north foot of Ores mountains of Algeria in the northern Africa. Timgad was reconstructed as a colonization city in about AD 100 by Roman Emperor Trajanus. The town was called "Pompeii of northern Africa". But unfortunately, it was destroyed in the seventh century by extension of Islamic power. Excavation of the ruins began in 1881. The triumphal arch of Trajanus, a sacred place or courthouse "Basilica", great public bathhouses, an outdoor theater of 3500 seats, public square "Forum" and drainage facilities were excavated from sand. Authors discovered that carvings of wheel ruts are remained at main streets of east and west "Decumanus Maximo" or main street of north and south "Cardo" of the town. The result of measurements are reported in this paper.