New Concepts and Designs for Accessing Managed LanesLarry Sutherland, National Technical Director of Highways

At a glance

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Look at the Congestion!

Why the Need for Innovative Ideas Relative to the Operations

of Managed Lanes

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Enter on crossroad entrance ramp and weave across general purpose lanes to merge with managed lanes -reverse for exiting

Traditional Methods - Weaving

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Typical Weaving Diagram for Freeways

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Traditional Methods – Weaving (Loss of Throughput)

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Table 2: Comparison of Crashes for a 3-Lane Directional Freeway with Weaving vs. Non-Weaving

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TRADITIONAL METHODS FOR PROVIDING ACCESS AND EGRESS FOR Interior MANAGED

LANES Without Weaving

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Traditional Methods – Bridge Over General Purpose Lanes

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Traditional Methods – Direct Ramps from Interchange Bridges

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INNOVATIVE SERVICE INTERCHANGE DESIGNS FOR BOTH GENERAL PURPOSE AND MANAGED LANES

With No Loss of Throughput

And No Increase in Crashes

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Innovative Designs –Single Ramp System for Both General Purpose and Managed Lanes (Traditional ROW)

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Diverging Diamond Interchange with Common Ramp for Managed Lanes and General Purpose Lanes

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Innovative Designs –Dual Ramp Systems for General Purpose Lanes and for Managed Lanes

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System Interchange one freeway has managed lanes and the other doesn’t

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“T” System Interchange for Managed Lanes with Managed Lanes on Both freeways

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“T” System Interchanges for Managed Lanesat the Second Level

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Four Legged System Interchange with Managed Lanes to be Constructed on Both Freeways

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Double Diverging Diamond with Outside Managed Lanes

• Double diverging diamond system to system with managed lanes