We did not witness this accident at the corner of South Lakes Street and Ridge Hights Street, but we were there before the police, firemen and doctors.  The road was covered with broken glass and the flipped over car's wheels were still spinning.

Our guess was that one SUV was turning left from Ridge Hights to South Lakes.  The other was hurrying down South Lakes from right to left.  The latter hit the former and since it still had the momentum, it knocked down a road sign, rolled over and finally stopped on its side.