He does indeed look to be perusing across the many lanes of traffic for prey. Being a mature Red-tail, I'm assuming he has the glide over the traffic to the grassy area where there will be prey, down and won't end up getting smacked by the tall cab of a truck..
Uh oh, I'm busted. He's spotted the camera and I looking at him.
And he's off. Pushing up and turning into the air with his left leg
The wings stretch out, tips up, and his body elongates.
The first down stroke. Note the position of his head and tail.
He rises. The second stroke, deeper and the tail and head bend into it.