see also: Philip
Baskerville Criminal Deposition
see also: Philip Baskerville Criminal Trial Testimony
BLACK HAWK COUNTY SHERIFF'S OFFICE
INCIDENT NUMBER : 96-89866
CLASSIFICATION: Julie Farrell
OFFICER: Sgt. Baskerville
CONNECTING INCIDENT: CF 96-83155
On 10-04-97 at approximately 2300 Hrs., there was a motor vehicle accident at the intersection of
HWY 58 and Greenhill Road in Cedar Falls. A vehicle driven by Tracy Rokes was west bound on
Greenhill Road. A vehicle driven by Juli Farrell was south bound on Hwy 58. The investigation
of the accident indicated that Mr. Rokes disobeyed the stop light that controlled his travel
direction. Julie Farrell die as a result of the collision and several people were injured.
I was contracted by Sgt. Todd Wilson of the Cedar Falls Police Department. Sgt. Wilson asked if
I could help with the investigation. The assistance would be limited to determine the speed of
the vehicles involved. I was supplied with various reports that were on file with the Cedar Falls
On 10-19-96, I went to L& M Towing to examine the vehicles. They were both in a fence secured
area to the rear. The Farrell vehicle was a 1988 Olds Cutlass Ciera, LIC/LIL370. The left side of
the car had extensive damage. The damage and dimensions of the care were measured and
recorded. An examination of the drivers seat belt gave no appearance that it was on at the time of
the collision. The right rear tail lamp was examined for distortion to the filaments and there was
not any distortion. The speedometer needle is wedge in about the 67 MPH area. The plastic
speedometer needle in place. The Rokes' vehicle was a 1996 Toyota 4Runner Limited. The
license plates had been removed. The VIN number was JT3HN87R6T0012802. This vehicle had
front damage pushed in and right to left. The front right wheel assembly was broken off. I
measured and recorded the damage and dimensions of the vehicle. There was not indication that
the seat belts were loaded at the time of the collision. Both the driver and passenger air bags had
been deployed. Both rear tail lamps were examined for abnormalities to the filaments. There
were no signs of distortion.
On 10-28-96, both vehicles were taken to the Black Hawk county Sheriff's Office impound
grange for storage.
On 10-31-97, I met with Sgt. Wilson at the accident scene. He showed me the impact area and
the location of the final rest for both vehicles. He indicated that tire-marks from a previous
accident were not related to this accident. There were several gouge marks in the road that show
where the impact of this collision happened. Impact occurred in the outside lane for southbound
traffic and in an area of the inside lane for westbound traffic. These marks were measured and
recorded. Using a 58-pound drag tire, I measured the coefficient of friction of the road surface.
The geographical layout of the road was measured.
Traffic signals control the intersection of Hwy 58 and Greenhill Road. Both roads are multiple
lane roads with center dividers. It is a concrete surfaced road. The area is somewhat rural as
there are not any buildings in the vicinity of the intersection. There are not any concerns of
visibility. The intersection is level. Hwy 58 is level. The approach of Greenhill Road to the
intrusion is a down hill approach from both east and west to the level traversing area of Hwy
On 02-06-97 I examined the speedometer face plates of both vehicles with various light sources.
The purpose of the examination was to see if there is any transfer to the face plate from the
speedometer needle upon impact. There was no associated marks found in the Rokes' vehicle.
The examination was done without removing the clear dust cover. I removed the broken pieces
of plastic that were in place around the speedometer of Ms. Farrell's car. As I was removing
them the needle fell back to "zero." Using various light sources I could see two marks. One was
in the area of 61 MPH and the other 67 MPH. These marks likely came from small pieces of
plastic from the dust cover and not needle slap.
Speed of these vehicles is determined from the physics principle of conservation of momentum.
For speed determination, the following information is considered: the approach angle of the
vehicles to one another, the angle of departure from impact, the after impact speeds and the
weights of the vehicles. Using this information, a range of speed for both vehicles can be
established. Mr. Rokes' vehicle would be 36 MPH to 45 MPH at impact. Ms. Farrell's vehicle
would be 49 MPH to 63 MPH at impact. If Mr. Rokes' vehicle was 36 MPH at impact, Ms.
Farrell's was 49 MPH. If Mr. Rokes' vehicle was 45 MPH at impact, Ms. Farrell's was 63 MPH.
Sgt. Philip Baskerville (signed)