travel speed

例句：

1. 1. The car's travel speed was reduced to 60 km/h.
   汽车的行驶速度被降低到每小时60公里。
2. 2. The train will reach the destination in about two hours at its travel speed.
   火车将以它的旅行速度大约两小时到达目的地。
3. 3. The plane's travel speed is limited by the air traffic control.
   飞机的旅行速度受到空中交通管制的限制。