traffic engineering division traffic operations traffic administration construction and maintenance...
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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
Traffic Engineering Division
• Traffic OperationsSignals
Signs
Banners and FlagsPavement MarkingsParking Meters
Traffic Operations - Signals
Electrical Shop:
Maintenance of 270 signalized intersections and school flashers and flashing beacons.
Traffic Operations - Signals
Electrical Shop:
Construction and upgrades of signalized intersections with digger derrick crew.
Traffic Administration - Intersection upgrades
Traffic signal upgrade:LED fixtures last longer, are brighter, & use less energy.
•Old •New
Traffic Operations - Signals
Electronic Shop:
Construction and maintenance of signal cabinets and controllers.
Traffic Administration - Intersection upgrades
Traffic cabinet upgrade:New controllers are more reliable and versatile.
•Old •New
Traffic Operations - Signs
Sign Shop:
Signs are Fabricated by screen printing and computer cut graphics.
Traffic Operations - Signs
Sign crews:
Installing all signs in the city except Interstate and US Route markers.
Traffic Operations - Signs
Sign Crews:
Maintain signs with top priority given to keep critical signs in place.
Traffic Operations - Banners
Banners:
Hang and maintain banners in the Downtown District.
Traffic Operations - Flags
Flags:
Hang and maintain flags on the Veteran’s Bridge.
Traffic Operations - Pavement Markings
Paint Shop:
Painting 550 miles of lane lines per year.
Traffic Operations - Pavement Markings
Paint Shop:
Mark lane lines in thermoplastic. New truck began in 2000.
Traffic Operations - Pavement Markings
Paint Shop:
Crosswalks, stop bars, and arrows are in thermoplastic.
Traffic Operations - Pavement Markings
Paint Shop:
Small thermoplastic jobs are done with the hand liner.
Traffic Administration - Railroad crossing upgrades
Railroad crossing upgrade:Resigning and using thermoplastic warning markings.
Traffic Operations -Parking Meters
Meter Shop:
Metered spaces provide parking space turnover which benefits businesses.
Approximately $450,000 per yr.revenue.
Traffic Operations -Parking Meters
Meter Shop:
Electronic meters are replacing less reliable & higher maintenance mechanical meters.
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
Traffic Administration - Engineering Design
Creating signal, sign, and work zone traffic control plans. Design review and approval of site plans and subdivisions.
Traffic Administration - Signal Coordination
Actuated Signal Control:Loop detectors are embedded in the pavement.
Traffic Administration - Signal Coordination
Automated Signal Control:
Microwave detector is triggered like a motion detector.
Traffic Administration - Signal Coordination
Coordinated Signal Control:
Computer systems used for closely spaced signals to keep traffic moving.
Traffic Administration - Signal Coordination
Coordinated Signal Control:
Downtown computer system consists of 76 signals.
Traffic Administration - Signal Coordination
Coordinated Signal Control:
Signals can be set to move traffic at the speed limit.
Traffic Administration - Traffic Studies
Traffic Counts:
TMC board used in signal timing studies.
Traffic Administration - Traffic Studies
Traffic Counts:
Road tubes used to determine volumes on a roadway.Volumes used in determining if a signal is warranted.
Traffic Administration - Traffic Studies
Speed Studies:
Radar gun used to determine 85th percentile speeds.
Traffic Administration - Traffic Studies
12,107 12,498
11,984
11,071
11,016 11,368
11,668
11,787
12,449
13,285
13,129
14,108
12,664
11,941
11,908
11,948
12,656
12,889 13
,502
15,018
15,884
15,859
15,831
10,500
11,500
12,500
13,500
14,500
15,500
16,500
1978
1980
1982
1984
1986
1988
1990
1992
1994
1996
1998
2000
Year
Accident Studies:
Total number of Accidents per year.
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 4.702 Hwy 153 north exit ramp to Hixson Pike north 28 4.333 4th Ave at E 37th St 11 3.744 Access Rd entrance Ramp to Hwy 153 south 40 3.485 E. Brainerd Rd at Hickory Valley Rd & I-75 ramp 38 3.236 McCallie Av at Holtzclaw Av 34 3.197 E 4th St at Walnut St 14 3.008 E 4th St at Lookout St 13 2.939 8th St at Georgia Av 12 2.9010 Moore Rd at Old Mission Rd 18 2.80
*number of accidents per million vehicles entering intersection
Traffic Administration - Traffic Studies
Upgrade intersections to reduce accidents. Adjust timing. Add left turn phases. Change signing or pavement marking.
Red Light Camera:
Catch red light runners by taking a picture of their car and license plate.
Traffic Administration
Traffic Administration - Guardrail
Guardrail system:
Speed zones of less than 40 MPH.
Traffic Administration - Guardrail
Guardrail system:
Speed zones of 40 MPH or more.
Traffic Administration - Sight Distance
Sight Distance Triangle:
Trim hedges for safety’s sake.
Traffic Administration - Sight Distance
Before
AfterSight Distance:
Traffic Administration - Street Lights
Street Lights:
Field check street light requests for new installations.
Traffic Administration - Street Lights
StandardStreet Lights:
Shoe box type, full cutoff. Used in Central Business District.
Traffic Administration - Street Lights
Pedestrian Lights:
Modified Ball and Basket with full cutoff.
Used in Central Business District.
Traffic Administration - Street Lights
Pedestrian Lights:
Acorn fixture with cutoff optics. Used in residential areas.
• Neighborhood Traffic Management
– Misconceptions
Traffic Administration - Neighborhood Traffic Management
More stop signs
Lower Speed Limits
Children at Play signs
Too Many Stops:
Reduces effectiveness of justified stops.
Traffic Administration - Neighborhood Traffic Management
Lower Speed Limits:
Most drive at speed that feels right.
Traffic Administration - Neighborhood Traffic Management
Traffic Administration - Neighborhood Traffic Management
“Children at Play” signs:
Give a false sense of security.
Neighborhood Traffic Management Program (NTMP):
Petition the city for a study.
Traffic Administration - Neighborhood Traffic Management
Traffic Administration - Neighborhood Traffic Management
NTMP Projects:
Old MissionTraffic Circles -Have reduced speeds and volume by 25%.
Traffic Administration - Neighborhood Traffic Management
•Traffic diverters•Traffic islands•Speed tables•Textured pavement
Traffic Engineering Division
• Traffic Operations - 757-5355
• Report signs down or signal malfunctions
• Traffic Engineering - 757-5005
• Request new installation or upgrade
• Request NTMP