Edmonds Speed SMD Certificate Halo 3_Nov 2024CERTIFICATE CONCERNING DESIGN AND CONSTRUCTION OF ELECTRONIC
SPEED MEASURING DEVICES
I, Katrina Sorich, do certify under penalty of the laws of the State of Washington that the following is
true and correct:
I have been employed as a technician by Verra Mobility for 4 years. I became a speed validation
technician in 2020 and have over 1200 hours performing speed validation tests. I am nationally certified as a
RADAR and LIDAR operator. The City of Edmonds currently uses the Halo 3TM fixed speed safety camera
system, an electronic speed measuring device provided through a contract with American Traffic Solutions,
Inc., doing business as Verra Mobility. Part of my duties include monitoring regular testing of the Halo 3 radar
fixed speed safety camera systems used by the City of Edmonds.
Verra Mobility contracted with the City of Edmonds to provide an Automated Speed Enforcement
(“ASE”) system designed to record the speed of a vehicle and obtain photographs or other recorded images of
the vehicle and the vehicle’s registration plate while the vehicle is traveling in excess of speed limits in certain
safety zones within posted limits.
The ASE program includes the use of the Halo 3 radar fixed speed safety camera systems at
the following locations within the City of Edmonds:
Location
Code
Location Description Lanes
Monitored
EDMF001 EB 212TH ST SW @ EDMONDS-WOODWAY HIGH 1
EDMF002 SB 76TH AVE SW @ EDMONDS-WOODWAY HIGH 1
EDMF003 SB 84TH AVE W @ CHASE LAKE ELEMENTARY 1
EDMF004 SB 100TH AVE W @ SCRIBER LAKE HIGH 1
EDMF005 WB 220TH ST SW @ WESTGATE ELEMENTARY 1
The Halo 3 radar fixed speed safety camera system operates by measuring vehicle speed, as well as
position relative to the radar to calculate and differentiate multiple vehicles in the radar beam. The speed of a
moving vehicle is measured by Doppler radar. Doppler radar is a generally accepted technology used for
measuring speed. The Halo 3 radar technology is used throughout the US and Europe as well as other countries
and is approved by the Swiss national metrology institute - METAS.
The Halo 3 radar fixed speed safety camera system uses a tracking radar sensor for measuring vehicle
speeds and detecting speed violations. The Halo 3 radar is aligned at a fixed angle across the road. The Halo
3 radar emits a horizontal beam over the road surface as represented by the illustration below. The tracking
radar can simultaneously detect multiple vehicles and measure their speed, distance, angle and movement
within the radar beam. The radar tracks multiple vehicles by reconstructing vehicle movement from the
measured object speed, angle and distance values. If a vehicle passes a defined trigger line, the radar outputs
the vehicle’s speed and lane information. The camera connected to the tracking radar uses this information to
determine if there is a speed violation and to capture photographs showing the measured speed and lane on the
databar of the captured images.
The tracking radar utilizes the Doppler Effect for speed determination. If an electromagnetic wave is
emitted at a moving object, then the wave is reflected back from the moving object. The frequency of the wave
received back by the radar shifts based on the speed of the moving object and its direction of travel. The
tracking radar continuously determines this frequency shift of each object to calculate the object’s speed. The
tracking radar consists of two receiving antennas integrated into a single radar sensor. This configuration
allows the radar to measure the distance and angle of the vehicle relative to the position of the radar sensor.
Illustration A and B show the measurement principle in simplified form. The radar sensor emits a radar beam
(illustration A). The radar beam is reflected by the vehicle (illustration B). The two receivers receive the
reflected radar beam. The radar sensor evaluates the return frequency, as well as the phase difference of the
reflected radar beam from both of the receivers. With the aid of these values the radar sensor calculates the
vehicle position.
1 - Radar sensor
2 - Transmitter
3 - Detected vehicle
1
2
3
– Receiver A
– Receiver B
– Reflected signal
4
5
6
A B
Scheduled system self-test are performed at least once daily. This self-test performs an electronic
tuning fork test to produce a specific frequency and returns an associated speed value. Only if the return value
meets the acceptance criteria to show that the system is operating correctly will the system enter measure mode.
Unless a self-test is successful, the system will not enter measure mode and no violations will be captured. In
addition, the system performs a series of image analytics on each triggered event to provide a secondary speed
verification. In conjunction with all internal system checks, and the manufacturer radar calibration certification,
the Halo 3 radar system is subject to routine and independent calibration check of the speeds produced by the
system at least annually by a qualified technician.
Speed validation tests are regularly performed on each installed and operable Halo 3 radar fixed speed
safety camera system. The test is conducted by having a LIDAR Operator obtain true measurements of up to
five vehicles per lane in the ascending and/or descending direction. The speed of the vehicle is captured by the
LIDAR Operator and then relayed via cellular to a Verra Mobility Technician. The Verra Mobility Technician
then compares the vehicle speed measured by the Halo 3 radar fixed speed safety camera system to the speed
measured by the LIDAR Operator to ensure the accuracy of the Halo 3 radar fixed speed safety camera system.
Verra Mobility maintains the results of each test in a Validation Report. The speed validation for each system
was performed on the following date and the systems at each location were found to be in proper working
order:
Location
Code
Location Description
Date of Test
EDMF001 EB 212TH ST SW @ EDMONDS-WOODWAY HIGH 11/22/2024
EDMF002 SB 76TH AVE SW @ EDMONDS-WOODWAY HIGH 11/22/2024
EDMF003 SB 84TH AVE W @ CHASE LAKE ELEMENTARY 11/22/2024
EDMF004 SB 100TH AVE W @ SCRIBER LAKE HIGH 11/22/2024
EDMF005 WB 220TH ST SW @ WESTGATE ELEMENTARY 11/22/2024
Preventative maintenance, including visual inspections, is regularly performed on the Halo 3 radar
fixed speed safety camera systems. Preventative maintenance activities include: cleaning of the cameras and
housing, general site inspection of environment and road conditions, inspection of poles, bases and
enclosures, and inspection of system cables and connections. The location and date that preventative
maintenance is performed is recorded in the Preventative Maintenance Log, which along with the Validation
Report(s) referenced above, is attached hereto.
I am a custodian, or otherwise qualified witness, as to the attached records. I make this declaration
based on personal knowledge, and if called and sworn as a witness, I could and would testify as set forth in the
following paragraph.
Attached as Exhibits are: Exhibit A - Speed Validation Reports, Exhibit B - Preventative Maintenance
Logs, and Exhibit C - Annual System Verification Certificate for all Halo 3 radar fixed speed safety camera
systems installed and used by the City of Edmonds. All documents and materials included as Exhibit A, Exhibit
B and Exhibit C are authentic and are what they purport to be, and accurately describe the matters set forth
therein. All such records are business records in that they are: (1) records kept in the ordinary course of
business; (2) created at or near the time of the transactions or events reflected therein by, or based on
information from, a person with knowledge of the transaction or events; and (3) kept as part of a regular
business activity.
Based upon my education, training, experience, and knowledge of the Halo 3 radar fixed speed safety
camera system, it is my opinion that the system is so designed and constructed as to accurately employ
measurement techniques based on a division of distance over time in such a manner that it will give accurate
measurements of the speed of motor vehicles.
Dated this 11stday of December 2024 in Mesa, AZ
Katrina Sorich, Speed Validation Technician