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COUNCIL BLUFFS INTERSTATE SYSTEM MODEL

Jon Markt

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Source: FHWA

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CBIS Project Overviewo Project challengeso Project solutions

CBIS Modelo Applications

• Construction Phasing• Construction Alternatives• Traffic Impacts / User Costs

o Innovations• Large Sub-area Microsimulation• Dynamic Traffic Assignment• Perpetually refined

PREVIEW

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By the numberso 18 - miles of interstate system reconstructedo 32 – number of bridges reconstructedo 5 – number of lanes on existing I-80 / I-29o 12 – number of lanes on future I-80 / I-29o 50+ - number of years since the original

construction of the CBISo 130,000 – projected 2030 daily traffic volume

on I-80 / I-29

CBIS PROGRAM

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o Traffic simulation model of Council Bluffso Applications

• Construction Phasing Analysis• Construction Alternatives Analysis• Traffic Impacts / User Cost

o Innovative Features• Dynamic Traffic Assignment• Large Sub-area Microsimulation• Perpetually refined

CBIS MODEL

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APPLICATIONS

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o Goal: Reduce overall program costso Strategy: Accelerate Constructiono Baseline Schedule

• Final work in fiscal year 2023• Cumulative construction cost: $734 million

o Accelerate Schedule• Final work in fiscal year 2020• Cumulative construction cost: $706 million

o User benefits of accelerated schedule?o User cost of concurrent work zones?

CONSTRUCTION PHASING

Daily Vehicle Miles Traveled (VMT) Daily Vehicle Hours Traveled (VHT) Primary road user costs for economic evaluation

USER COST

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Base 2 Lane US 275 NB OffRamp Closure

NB OnRamp Closure

SB On and Off Closure

9,850,000

9,855,000

9,860,000

9,865,000

9,870,000

9,875,000

Base 2 Lane US 275 NB OffRamp Closure

NB OnRamp Closure

SB On and Off Closure

234,000

234,500

235,000

235,500

236,000

236,500

237,000

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INNOVATIVE FEATURES

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Limited to particular strategies

Small models, suited for localized impacts

Projects evaluated in isolation

WORK ZONE ANALYSIS

Source: Oregon DOT

Source: FHWA

o Large Sub-area Microsimulation• Addresses network impacts• Inclusion of boundary effects• Couples with DTA to show spatial

impacts of congestion on traffic flow and user costs

CBIS MODEL

o Dynamic Traffic Assignment (DTA)• Time-sensitive routing tool• Greater sensitivity to congestion than traditional assignment methods (permits queuing)

CBIS MODEL

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IDENTIFYING IMPACTS Union Pacific Railroad Bridge

Reconstructiono Single lane vs. full closureso Ramp closureso Extent of impacts?

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Dual calibration – before & “after” constructiono Before

• AirSage origin-destination data• INRIX speed data

o After• Iowa DOT sensor data and video• INRIX speed data

Sub-area refinement and analysiso Refined input values incorporated in the

regional model

PERPETUALLY REFINED

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Key insightso DTA and larger microsimulation networks

address gaps in traffic analysis and are becoming more practical for day-to-day use

o Model calibration is changing due to innovative new forms of data, better data collection infrastructure, advances in traffic models

o Model as an asset, rather than single use

CBIS INNOVATIONS