transportation offices until a car starts to make an illegal u-turn on a busy street. a security camera captures the driver waiting for traffic to clear as walter rivera rides his motorcycle down the same street only a few hundred feet away. >> there's a hill, and going over the top of the hill is kind of a blind spot. i didn't see her until the last minute, so there was nothing i could do. >> sparks fly as the helmetless rivera drops his bike to the ground and slides into the back wheel of the car. the motorcycle goes up in flames as the car pulls over. rivera lays unconscious and on fire next to the burning wreckage. >> so i was laying there burning for 30 seconds, and there was a crowd of people outside. but you can understand, people were scared it was going to explode. >> a car approaches the flaming motorcycle and then turns away. but john solecki hears the accident from inside his office and races out to help.