A sketch planning assessment of managed lane options for the i 5 freeway corridor master plan
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A Sketch Planning Assessment of Managed-Lane Options for the I-5 Freeway Corridor Master Plan. William R. Loudon, DKS Associates. Overview of Analysis. Purpose To assess the potential of managed-lane strategies

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A Sketch Planning Assessment of Managed-Lane Options for the I-5 Freeway Corridor Master Plan

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A sketch planning assessment of managed lane options for the i 5 freeway corridor master plan

A Sketch Planning Assessment of Managed-Lane Options for the I-5 Freeway Corridor Master Plan

William R. Loudon,

DKS Associates


Overview of analysis

Overview of Analysis

Purpose

  • To assess the potential of managed-lane strategies

  • To determine what impact each could have on vehicular demand and LOS on I-5 in 2035

    Approach

  • Sketch-planning adjustment of model results

  • Optimistic but reasonable assumptions used about each

  • Draw on reported experiences when available


Managed lane options

Managed Lane Options

  • High Occupancy Vehicle (HOV) Lanes

  • High Occupancy Toll (HOT) Lanes

  • Truck-Only Lanes


Potential effects of managed lanes

Potential Effects of Managed Lanes


Hov lanes in us

I-394

I-15

I-25

SR-91 &

I-15

I-10 &

US-290

HOV Lanes in US

124 HOV Facilities in the US

National Experience:

I-95

Yellow – HOV Lanes

Red – HOT Lanes


Washington hov lanes on six lane roadways

Washington HOV Lanes on Six-Lane Roadways


Hov lanes analysis methodology

HOVLanes – Analysis Methodology

  • Develop and apply reasonable percentages of HOV-eligible vehicles from peer review

  • Estimate mode shift to and from employment sites based on reported experiences

  • Estimate shift in HBW vehicle trips

  • Estimate HOV and mixed-flow lanes LOS based on estimates of mode shift and HOV lane use


Hot lanes in us

HOT Lanes in US

  • Washington

    • HOT Lanes on SR 167

  • US

    • I-10 (13 miles) and US 290 (13.5 miles) in Houston

    • SR 91 (10 miles) and I-15 (8 miles) in Southern California

    • I-394 in Minneapolis (11 miles)

    • I-25 in Denver (6.5 miles)

    • I-15 in Salt Lake City (38 miles)

    • I-95 in Miami (21 miles)


Hot lanes analysis methodology

HOTLanes – Analysis Methodology

  • Develop diversion rates from mixed-flow to HOT lanes based on available lane capacity

  • Apply diversion rates to future forecasts of I-5 volume with HOV to get estimates of HOT lane usage and mixed-flow lane usage

  • Estimate HOT and mixed-flow lanes LOS based on estimates of HOT lane use


Truck only lanes in us

Truck-Only Lanes in US

  • New Jersey Turnpike* (I-95) – 32 miles with toll

  • California (I-5) – 2.4 miles including tunnel

  • Louisiana (Clarence Henry Truckway) – 3.5 mile intermodal connector

  • Massachusetts (South Boston Haul Road) – 1.5 mile tunnel

  • Six truck-only ramps, bridges (3 tolled) or bypasses of less than one mile

    * Actually has passenger-car-only lanes. Passenger cars can use the truck lanes.


Truck only lanes analysis methodology

Truck-Only Lanes – Analysis Methodology

  • Use regional model to get estimate of truck volumes by time period

  • Develop reasonable diversion rates for trucks from mixed-flow to truck-only lanes

  • Estimate truck-only and mixed-flow lanes LOS based on estimates of truck-only lane use


Conclusions

Conclusions

  • HOV and HOT lanes are worth additional consideration

  • Truck lanes would do have sufficient benefit to warrant restriction


Conclusions continued

Conclusions (Continued)

  • Sketch-planning methods can help evaluate managed-lane options in a cost-effective manner to support a phased decision-making process.

  • Reported experiences from other managed-lane systems can be used to produce reasonable estimates of potential for managed-lanes options.

  • The approach allowed for quick screening of options in the I-5 corridor in the initial phase of the master plan.


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