ACTIVE TRAFFIC MANAGEMENT:DESIGN & OPERATIONS CHALLENGES

ON THE ILLINOIS TOLLWAYJim Powell, PE, PTOE

CDM Smith Inc.

powelljl@cdmsmith.com

IBTTA MAINTENANCE &ROADWAY OPERATIONS WORKSHOP

Harrisburg, PAJune 25, 2018

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PRESENTATION OVERVIEW:

Concept & General Approach Design

• Smart Corridor Elements• Power, Communications & Site Features

Operations• Lane-Use Control (LUC) displays• Response Plans & Scenarios

Future Implementation

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INITIAL CORRIDOR: I-90

62 MILES TOTAL – 16 WITH ATM INITIALLY

“Flex Lane”

Gantry Lane Control Signs + DMS

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• Desire to “do it right” - previously had to rebuild median wall (new structure foundations)

• Already have electronic toll collection & fiber everywhere

• Talked to FHWA, visited Washington State DOT and Virginia DOT

• Lessons learned

½ mile gantry spacing still good & frequent DMS

2 Gantry advance messaging best - any more & drivers ignore

CONCEPT: SMARTROAD FOR THE FUTURE

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• Lessons learned (cont.)

Need public & media outreach – variable speed limit fared badly in the press

(Instructional video)

Yellow arrow displays:

GENERAL APPROACH

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• Inside shoulder – “Flex Lane” for Pace transit

• ATM gantry foundations built where ATM expected in future: ½ mile spacing for 22 miles

• Increased shoulder DMS - every other gantry

• Intermediate power & communications buildings every 2 miles

DESIGN FOR SMARTROAD

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DESIGN: POWER, COM. & SITE FEATURES

• CCTV cameras everywhere

• Power & backbone communications with redundancy

• Median wall fiber & conduit with lateral conduit

• Safe parking near buildings & devices for maintenance

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I-90 SMARTROAD – DISPLAY SUMMARY

plus large DMS ~every 5 mi.

Every other gantry

Every other gantry

Shoulder DMS

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• ATM gantries: 29

• ATM lane control signs: 354

• CCTV: +35 cameras

• DMS: +8

• Detector stations: +75

I-90 SMARTROAD – ATM SUMMARY

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OPERATIONS: RESPONSE PLANS• Concept of Operations looked at nine common scenarios

Clear presentation of response plans Consistent workflow Ability of operators to review & activate

Clear RulesConsistent Messaging

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I-90 ATM BEFORE/AFTER STUDY

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ATM IN ACTION

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ATM IN ACTION

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ATM IN ACTION

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ATM IN ACTION

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DESIGN LESSONS LEARNED

• ATM gantry placement

Must be located before locating static sign gantries

Must be placed in conjunction with striping & lane geometry

Avoid bridges

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OPERATIONS LESSONS - “TO BE LEARNED”

• As more incident experience gained:

Stored response plans must be updated, e.g., display lane use instructions further upstream?

More detailed evaluation of ATM performance

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FUTURE IMPLEMENTATION

• I-90 a warmup for I-294

PotentialATM Lite on parts of I-294

I-90

I-294

ATM LITE

Next MUTCD not likely until ~2020!

Reach out to NCUTCD or joinwww.ncutcd.org

Monitor the FHWA website (for NPA)mutcd.fhwa.dot.gov/

Monitor your state DOT web site

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FHWA MUTCD – THE “LAW”

Thanks !

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