She was Lucky
According to a 2014 Business Fleet magazine article a 20-pound object traveling at 55 mph hits with the force of 1,000 pounds at the time of impact. That is a compelling statement as to why load securement is necessary.
This video is a great example of why load securement is so critically important on our roadways. Thankfully no one was hurt in this instance but others have not been so fortunate.
Source: Video originally posted by Wendy Cobb on 4/2/2011 on her YouTube channel.