The collision between two cars and the head of a police officer is one of the most dangerous collisions in America.
The crash was caught on camera by a bystander.
It has been the focus of protests in the U.S. for months and prompted a call to federal authorities to investigate the incident.
A witness told the Dallas Morning News that the officer was driving down the road when a black Honda Civic he was driving hit him and sent him flying over the median, hitting the police officer and denting his face.
The police officer was in serious condition.
The Dallas Police Department says the officer’s injuries were non-life-threatening.
But many of the drivers in the video were in the middle of a race, and many are in the same vehicle.
One person was seen getting out of his car and trying to get the officer out of the way.
The other driver, who was behind the officer, then hit the car in front of him, knocking it over and sending the car rolling down the highway.
It’s a deadly collision, and one that’s been a flashpoint in the protests over police brutality and racial injustice.
Dennis Van Zant, a professor at Texas A&M University and a veteran journalist, has been documenting the protests.
He says it’s important for people to understand that police are not the only people on the road.
“I think that’s the lesson we’ve got to take away from this,” he said.
“That police have a job to do, to protect the lives of the people, and not just be the ones who drive.
And not just the ones in the front seat, but the ones that are driving.”
We want to get to the root of this, and it’s not just race, Van Zants said.
It has been a particularly dangerous year for black people, especially in the United States.
In August, a black man was shot and killed by a police sniper in South Carolina.
The video also showed a woman and her boyfriend driving away from the scene, in what was described as an “unprecedented” display of white supremacy.
Police say the woman was arrested after she ran into a store and pulled out a gun.
She was charged with reckless driving, possession of a firearm, reckless endangerment and unlawful discharge of a weapon.
The boyfriend was also charged with disorderly conduct.
He posted $20,000 bail.
The Associated Press contributed to this report.