Traffic Engineering Division

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Traffic Engineering Division

• Traffic Operations

• Traffic Administration

Construction and maintenance of traffic control
devices.

• Engineering design
• Signal Coordination
• Traffic Studies
• Neighborhood Traffic Management

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Traffic Engineering Division

• Traffic Operations

Signals
Signs
Banners and Flags
Pavement Markings
Parking Meters
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Traffic Operations - Signals
Electrical Shop Maintenance of 270 signalized
intersections and school flashers and flashing
beacons.
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Traffic Operations - Signals
Electrical Shop Construction and upgrades of
signalized intersections with digger derrick crew.
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Traffic Administration - Intersection upgrades
Traffic signal upgrade LED fixtures last longer,
are brighter, use less energy.

• Old

• New

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Traffic Operations - Signals
Electronic Shop Construction and maintenance of
signal cabinets and controllers.
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Traffic Administration - Intersection upgrades
Traffic cabinet upgrade New controllers are more
reliable and versatile.

• Old

• New

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Traffic Operations - Signs
Sign Shop Signs are Fabricated by screen
printing and computer cut graphics.
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Traffic Operations - Signs
Sign crews Installing all signs in the city
except Interstate and US Route markers.
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Traffic Operations - Signs
Sign Crews Maintain signs with top priority
given to keep critical signs in place.
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Traffic Operations - Banners
Banners Hang and maintain banners in the
Downtown District.
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Traffic Operations - Flags
Flags Hang and maintain flags on the Veterans
Bridge.
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Traffic Operations - Pavement Markings
Paint Shop Painting 550 miles of lane lines
per year.
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Traffic Operations - Pavement Markings
Paint Shop Mark lane lines in thermoplastic.
New truck began in 2000.
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Traffic Operations - Pavement Markings
Paint Shop Crosswalks, stop bars, and arrows
are in thermoplastic.
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Traffic Operations - Pavement Markings
Paint Shop Small thermoplastic jobs are done
with the hand liner.
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Traffic Administration - Railroad crossing
upgrades
Railroad crossing upgrade Resigning and using
thermoplastic warning markings.
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Traffic Operations -Parking Meters

• Meter Shop
• Metered spaces
• provide parking space turnover which benefits
  businesses.
• Approximately 450,000 per yr.
• revenue.

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Traffic Operations -Parking Meters
Meter Shop Electronic meters are replacing less
reliable higher maintenance mechanical meters.
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Traffic Engineering Division

• Traffic Operations
• Signals
• Signs
• Banners and Flags
• Pavement Markings
• Parking Meters

• Traffic Administration
• Engineering design
• Signal Coordination
• Traffic Studies
• Street Lights
• Neighborhood Traffic Management

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Traffic Administration - Engineering Design
Creating signal, sign, and work zone traffic
control plans. Design review and approval of
site plans and subdivisions.
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Traffic Administration - Signal Coordination
Actuated Signal Control Loop detectors are
embedded in the pavement.
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Traffic Administration - Signal Coordination
Automated Signal Control Microwave detector is
triggered like a motion detector.
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Traffic Administration - Signal Coordination
Coordinated Signal Control Computer systems
used for closely spaced signals to keep traffic
moving.
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Traffic Administration - Signal Coordination
Coordinated Signal Control Downtown computer
system consists of 76 signals.
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Traffic Administration - Signal Coordination
Coordinated Signal Control Signals can be set
to move traffic at the speed limit.
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Traffic Administration - Traffic Studies
Traffic Counts TMC board used in signal timing
studies.
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Traffic Administration - Traffic Studies
Traffic Counts Road tubes used to determine
volumes on a roadway. Volumes used in determining
if a signal is warranted.
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Traffic Administration - Traffic Studies
Speed Studies Radar gun used to determine 85th
percentile speeds.
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Traffic Administration - Traffic Studies
Accident Studies Total number of Accidents per
year.
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Traffic Administration - Traffic Studies
TOP 10 HIGHEST ACCIDENT RATE LOCATIONS OF
2000 LOCATION
NO. OF ACC. ACC.RATE 1 M.L. King
Blvd at Hwy 27 exit ramp and Pine St 26
4.70 2 Hwy 153 north exit ramp to Hixson
Pike north 28 4.33 3 4th Ave at E
37th St 11 3.74 4 Access Rd
entrance Ramp to Hwy 153 south 40
3.48 5 E. Brainerd Rd at Hickory Valley Rd
I-75 ramp 38 3.23 6 McCallie Av at
Holtzclaw Av 34 3.19 7 E 4th St
at Walnut St 14 3.00 8 E 4th St
at Lookout St 13 2.93 9 8th St
at Georgia Av 12 2.90 10 Moore
Rd at Old Mission Rd 18
2.80 number of accidents per million vehicles
entering intersection
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Traffic Administration - Traffic Studies

• Upgrade
• intersections to
• reduce accidents.
• Adjust timing.
• Add left turn
• phases.
• Change signing or
• pavement marking.

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Traffic Administration
Red Light Camera Catch red light runners by
taking a picture of their car and license plate.
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Traffic Administration - Guardrail
Guardrail system Speed zones of less than 40
MPH.
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Traffic Administration - Guardrail
Guardrail system Speed zones of 40 MPH or more.
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Traffic Administration - Sight Distance
Sight Distance Triangle Trim hedges for
safetys sake.
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Traffic Administration - Sight Distance
Sight Distance
Before
After
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Traffic Administration - Street Lights
Street Lights Field check street light requests
for new installations.
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Traffic Administration - Street Lights
Standard Street Lights Shoe box type, full
cutoff. Used in Central Business District.
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Traffic Administration - Street Lights
Pedestrian Lights Modified Ball and Basket with
full cutoff. Used in Central Business District.
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Traffic Administration - Street Lights
Pedestrian Lights Acorn fixture with cutoff
optics. Used in residential areas.
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Traffic Administration - Neighborhood Traffic
Management

• Neighborhood Traffic Management
• Misconceptions

More stop signs
Lower Speed Limits
Children at Play signs
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Traffic Administration - Neighborhood Traffic
Management
Too Many Stops Reduces effectiveness of
justified stops.
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Traffic Administration - Neighborhood Traffic
Management
Lower Speed Limits Most drive at speed that
feels right.
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Traffic Administration - Neighborhood Traffic
Management
Children at Play signs Give a false sense of
security.
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Traffic Administration - Neighborhood Traffic
Management
Neighborhood Traffic Management Program
(NTMP) Petition the city for a study.
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Traffic Administration - Neighborhood Traffic
Management
NTMP Projects Old Mission Traffic Circles
-Have reduced speeds and volume by 25.
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Traffic Administration - Neighborhood Traffic
Management

• Traffic diverters
• Traffic islands
• Speed tables
• Textured pavement

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Traffic Engineering Division

• Traffic Operations - 757-5355
• Report signs down or signal malfunctions
• Traffic Engineering - 757-5005
• Request new installation or upgrade
• Request NTMP