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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
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
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

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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