Wikipedia: Evidence of wheeled vehicles appears from the mid 4th millennium BC, near-simultaneously in Mesopotamia, the Northern Caucasus (Maykop culture) and Central Europe, so that the question of which culture originally invented the wheeled vehicle remains unresolved and under debate.The earliest well-dated depiction of a wheeled vehicle (here a wagon—four wheels, two axles), is on the Bronocice pot, a ca. 3500–3350 BC clay pot excavated in a Funnelbeaker culture settlement in southern Poland.
The oldest toy car is as old as 5500 BCE and was found near the North Kurdish town of Qoser (Kızıltepe). The car is worked on stone, has axles of different length and pre-dates Indoeuropeans by a lot.Previously the oldest known toy cars were from Turkmenistan (Altyndepe) or Mesopotamia, being dated to the fourth millennium BCE.Other findings in the same site (also worked on stone) are dolls and whistles, the latter still able to produce sounds. These however could be more recent, from the fourth millennium.
Archaeologist Mesut Alp said that the toy car, which is made out of stone, dates back to the late Stone Age and is thought to be 7,500 years old. …. The second new relic on show at the museum is an ancient stone tablet inscribed with writing. Following exhaustive historical analysis, the writing on the 5 centimeter stone — which was uncovered at an excavation site at the Gırnavas Mound, 4km from the historic district of Nusaybin — was deemed to be the content of an ancient title deed. ……
…. comprehensive information on the two finds will be provided soon.