The truck that you see in this photo did not get knocked over by another vehicle. It tipped over from the wind. It is hard to believe that winds can be so strong. During the fall and winter months, it is quite common to have Santa Ana winds in the Southern California area. These are extremely strong winds that can be either hot or cold, depending on the weather in the Great Basin or Mojave Desert. These winds often bring in hot, dry weather.
The worst part is they keep the wildfires going.