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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. 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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  1. A Sketch Planning Assessment of Managed-Lane Options for the I-5 Freeway Corridor Master Plan William R. Loudon, DKS Associates

  2. 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

  3. Managed Lane Options • High Occupancy Vehicle (HOV) Lanes • High Occupancy Toll (HOT) Lanes • Truck-Only Lanes

  4. Potential Effects of Managed Lanes

  5. 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

  6. Washington HOV Lanes on Six-Lane Roadways

  7. 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

  8. 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)

  9. 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

  10. 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.

  11. 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

  12. Conclusions • HOV and HOT lanes are worth additional consideration • Truck lanes would do have sufficient benefit to warrant restriction

  13. 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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