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On the 11th holiday, Xiaoming and his family traveled to Mount Tai. On the Fokai Expressway, they saw a traffic sign at the entrance of Caihongling Tunnel (pictured).

(1) "80" means that the speed limit is 80 km/h after the car enters the tunnel;

(2) According to the meaning of the question, t=4min= 1 15h, s=5.068km,

The speed of the car through the tunnel:

v = ST = 5.068km 1 15h = 76.02km/h < 80km/h，

Cars obey traffic rules.

So the answer is: (1) After the car enters the tunnel, the speed limit is 80 km/h;

(2) Because the speed of the car does not exceed the speed limit, the car should obey the traffic rules when crossing the tunnel.

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