At the beginning Bonnie's wreck is shown with her car leaving the road and wrecking in the field. When Ponch and Jon arrive, her car is now pointing toward the road, as if it had been turned 180 degrees to face the opposite direction.
When the CHP cruiser crashes a roll bar is visible through the side window as it gets airborne.
A convenient ramp is built off the side of the road where Bonnie crashes.