因為車流量多，一旦前面有車禍，後面的汽車很容易反應不及，所以容易出現連

因為車流量多，一旦前面有車禍，後面的汽車很容易反應不及，所以容易出現連環車禍。

結果 (英文) 1:

Because there is a lot of traffic, once there is a car accident in the front, the cars in the back can easily fail to respond, so it is easy to have a serial car accident.

結果 (英文) 2:

Because the traffic flow is large, once there is a car accident in front, the car behind is easy to fail to react, so it is easy to have a series of car accidents.

結果 (英文) 3:

Because of the traffic flow, once there is a traffic accident in front, the car behind is easy to react less than, so it is easy to have a series of accidents.