Joke Collection Website - Bulletin headlines - During the May Day holiday, Xiao Ming and his family went out to travel and saw a traffic sign at the entrance of Yangjiayuan tunnel on the expressway (pictured).
During the May Day holiday, Xiao Ming and his family went out to travel and saw a traffic sign at the entrance of Yangjiayuan tunnel on the expressway (pictured).
(1) "is a speed limit sign, which means that the speed of the car is not allowed to exceed 80kmh；;
(2) tunnel length s=2590m=2.59km, time t = 2min = 1.30h,
Therefore, the speed: V = ST = 2.59 km130h = 77.7 km/h < 80 km/h, so the car obeys the traffic rules when crossing the tunnel.
So the answer is: km/h; Obey.
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