Who knows, what's the joke about tractors running too fast?

It is said that one person bought a Mercedes-Benz 600, cool! A month later, the license plate came down and I was in a good mood. I didn't say anything. Take the highway! 200 per hour, fun! Suddenly I saw a tractor parked on the side of the road, and an old man waved the car to stop! The buddy was in a good mood and stopped to ask, Grandpa, what's the matter? Old man: My car is broken. I want you to tow it away! This guy is in a good mood to agree. It's a miracle-Mercedes held his hand! The old man added: It's a pity that your car is so good! Tell you what, you drive slowly. If I can't stand walking the tractor, I'll turn right! If my old man can't stand it, I'll turn on the left turn signal! Okay？ Yes, no problem! This guy drove 60 yards and got on this tractor! From 200 to 60, dizzy! ! Keep driving and find a BMW passing by at a speed of more than 200! This buddy is anxious: Kao! ! I'm afraid of you! As he spoke, he slammed on the accelerator and accelerated to more than 200, completely forgetting that there was an old man behind him! So the two cars accelerated at high speed! What the police found on the road! Just reported to the headquarters: headquarters headquarters, found a Mercedes-Benz and a BMW racing! 280 yards an hour! ! ! Wait ... ah! ! There is also a tractor following closely, constantly turning on the left turn signal, he! Him! He still wants to overtake! ! ! ! ! The answer comes from:/viewdiary.20742.html.