The Tractor and the Excavator

S1 E14: Little funny Tractor plays with a ball in Cars Town. Suddenly, he sights the Excavator who is repairing the main road in Cars Town. Tractor is very glad to play with his friend. But Excavator is too busy. So he angrily has just thrown the ball into the air! Tractor starts to drive on the high speed along the road to catch the ball! It is so dangerous! Who will help Tractor to avoid an accident?