The typical speed of a kids’ car is about 5 miles per hour. Many parents are surprised to learn that their child’s toy runs so slowly, but it’s a safety feature. The speed of a car depends on many factors. Those include the weight of the car, the engine, the terrain, the weather, and the driver’s skill.
The speed also depends on the car, but most can go up to 80 or above 77 miles per hour, depending on the road conditions. Kids are growing up faster and faster and cars are becoming safer and safer so the short answer to this question is, it depends on the car.