Running at 100km per hour

The recent trip to Philippines, during the drive to Clark Airport. We were traveling in a van at 100km per hour and I still manage to get this shot from the van's window without getting blurry image. This can be achieve by using fast shutter speed. Setting was ISO:400 @ 1/1000 no vr. The noise reduction was turn off as you can see some noise on the sky area. In order to freeze movement in picture, the shutter speed must 1/1000 or above.