Car rolls up hill in neutral gear - strange

GPS coordinates 24°43'21.87"N 39°26'35.85"

How to get there; Take the King Fahad Road, which leads directly to Ohud mountain. When you reach near the parking of the Ohud, keep watching for a double road on your right side while moving on the circular road. * Take the right turn, this is still King Fahad road and it will become Ibrahim road after university road signal. Keep going on this, now single, road about 30 to 35 km till it ENDS... At the end of the road, there are mountains on all three directions and you have to take u-turn via a round about there.