Download - ATM in Minnesota During Weather Events
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ATM in MinnesotaDuring Weather EventsBrian KaryFreeway Operations Engineer
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Active Traffic Management
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• ILCS located every ½ mile over every lane.
• ILCS are a 4ft x 5ft full color matrix signs.
• Use of the ILCS is for incident management , speed harmonization and priced dynamic shoulder lane.
• I-35W – about 190 ILCS• I-94 – about 110 ILCS
IIntelligent Lane Control Signals
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ILCS Sign Options
Blank – default
Green – Lane Open
Flashing Yellow – Caution
Red X – Closed
Yellow X – Closed Ahead
Merge
Speed Limit
White Diamond
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Variable Speed Limits• Advisory Only• Detection measures
traffic speeds downstream
• Speeds are posted up to 1 ½ miles upstream
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Overview of VSL Control• Goal is to mitigate shock wave propagation from
downstream bottleneck by gradually reducing speed levels of incoming traffic flow.
Speed
Direction of Travel
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Advisory Variable Speed Limits
35MP
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35MP
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35MP
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35MP
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40MP
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40MP
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Congested Traffic
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35MP
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35MP
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35MP
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35MP
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40MP
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Advisory Variable Speed Limits
Congested Traffic
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VSL Control During Weather• VSL system uses a constant deceleration rate to determine
advisory speed limit values.– Preferred deceleration rates are different during weather.
• Upper speed limit cap is 5 MPH less than posted speed limit.– System posting 60 MPH during snow events.– Have since changed upper speed limit cap to 50 MPH
• Developing new techniques for VSL operations during weather events.
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I-35W MnPASS: Active Traffic Management PDSL Open
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Priced Dynamic Shoulder Lane (PDSL): Segment 3: 3 miles
• Priced Dynamic Shoulder Lane North of 42nd St on NB 35W
• Maintains existing 4 lanes with an added PDSL Lane
• Effectively extends the MnPASS lane to downtown Minneapolis using existing road space
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Innovative Use of Technology and Infrastructure
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I-35W MnPASS: Active Traffic Management PDSL Closed
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I-35W MnPASS: In Pavement Lighting PDSL Closed
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I-35W MnPASS: In Pavement Lighting PDSL Open
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I-35W MnPASS: In Pavement Lighting
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I-35W MnPASS: In Pavement Lighting Corrosion and Failure
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PDSL During Snow & Ice• PDSL is left open
during snow & ice events
• Traffic helps to spread de-icing material
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ATM During Rainfall Event• Shoulder designed to allow some ponding during
heavy rainfall. • Section of I-35W where MnPASS lane is on the old
inside shoulder.• Investigating the use of rainfall sensor to deploy warning message or advisory speed limit.
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Questions?
Brian KaryFreeway Operations Engineer