Mr. Thompson, on whose website the RedLightCamera video was stored,
provided me with this link:
http://www.snopes.com/photos/accident/carcrash01.asp

The web site says that the video was indeed "captured by a red-light
enforcement camera." It goes on to say:

The accident seen in the video occurred at 12:40 p.m. on 23 May 2004 at
the intersection of Third Street and Edwin C. Moses Boulevard in Dayton,
Ohio. Betty J. Hayslip, 75, of New Lebanon, driving a PT Cruiser, ran a
red light and struck a Subaru driven by Albertina L. Walker, 41, of
Dayton. The collision caused the Subaru to roll over one and a half
times; it came to rest upside-down and in the process crashed into
pedestrian Scott Tegtmeyer, 42, of Dayton.

Tegtmeyer, who was crossing the street in the same direction as the PT
Cruiser and had just reached the curb on the opposite side, can be seen
in the video breaking into a desperate run as the collided vehicles bear
down on him. He could not react quickly enough, however, and the Subaru
rolled atop of him, dragging him several feet across the intersection.
Although medics who found Tegtmeyer's bloodied body amidst a sea of
broken glass initially pronounced him dead at the scene, he began
breathing while in transit with paramedics and was fully resuscitated by
doctors. (As of 2 June 2004, Tegtmeyer was reported as being in serious
condition at Miami Valley Hospital.)

Investigators said that at the time of the accident the crosswalk signal
was red, and therefore Tegtmeyer should not have been crossing the
street. They also reported that Tegtmeyer miraculously escaped alive
because the dent in the side of the Subaru caused by the crash created a
hollow space that allowed the vehicle to roll over him without crushing
him to death. Neither vehicle was carrying any passengers, and both
drivers escaped with only minor injuries.

The crash was captured by one of the automated red-light enforcement
cameras installed at a dozen intersections around Dayton to help reduce
crashes caused by drivers running red lights. Each camera records
12-second motion videos used to issue citations to offending motorists.