Los Angeles County Metropolitan Transportation Authority I-710 Schematic Geometric Plans Reviews for Alternatives 5C & 7 presented to the Technical Advisory Committee February 19, 2014 Geometric Focus 2 Alternative 1 • Hot Spots Alternative 5C • Truck Bypass • Buffered Lanes • Ramp Braiding Alternative 7 • Freight Corridor Access Points • Between Freeway & Freight Corridor • Between Local Street & Freight Corridor 2 3 3 3 1.6 miles ALT 1 SR-60 I-5 7.4 miles 4 I-105 4 2.7 miles 5 SR-91 3 3.6 miles 4 3 2.5 miles I-405 3 3 1.6 miles SR-1 2 OCEAN EXISTING THRU LANES IN EACH DIRECTION 3 ALT 1 I-5 NORTH WASHINGTON ATLANTIC/BANDINI FLORENCE CENTRAL FIRESTONE/SOUTHERN IMPERIAL I-105 ROSECRANS ALONDRA SR-91 SR91 DEL AMO I-405 I-405 SANTA FE / WARDLOW WILLOW SOUTH PCH-ANAHEIM PICO Freeway Hot Spot DOWNTOWN I-710 Local Hot Spot 4 Alternative 1 5 What is a Freeway HOT SPOT? • High conflict area where incidents frequently occur • Correlates with recorded accidents • Safety and Operation are influenced by incidents, which include: • Slowing caused by merging and weaving • Near misses • Collisions 5 6 Hot Spot Example: SB 405 Merging into SB 710 Anatomy of a Merge Merge: Looking Ahead Merge: Looking Behind 7 Weaving Example Short Distance Entrance 8 Anatomy of a Weave Begin Weave: Driver starts from left Slow truck in front starts on right 9 Anatomy of a Weave Driver slows & moves right Driver completes weave over short distance 10 Why do freeways stop? 11 • An incident occurs • Drivers slow to maintain a safe distance • Drivers further back see brake lights and slow down When traffic volume increases, the frequency of incidents increases, especially at Hot Spots Analogy: Water through a funnel Design Strategies 12 Improve Merging by adding Auxiliary Lanes: • Increases distance to merge safely • Reduces incidents • Reduces congestion 1 13 Design Strategies Eliminate Short Weaving Areas by Braiding Ramps: • Eliminates conflict zone • Reduces incidents • Reduces Over congestion Under 1 PRELIMINARY CONCEPT – FOR DICUSSION PURPOSES ONLY SR-60 Major Infrastructure Components: ALT 5C I-5 • Additional Through Lanes (1 per direction) Where Needed • Modernization: Reconfigure Interchanges and Add Auxiliary Lanes Corridor ZE/NZE Strategies: • Truck Commercialization • Incentive Programs • Exposure Reduction Programs I-105 SR-91 I-405 Truck Bypass Lane Buffered Downtown Only Lane General Purpose Lane SR-1 OCEAN Auxiliary Lane / Ramp Freeway Interchange Geometric Redesign Local Interchange Geometric Redesign Minor Local Interchange Improvement 14 PRELIMINARY CONCEPT – FOR DICUSSION PURPOSES ONLY SR-60 Major Infrastructure Components: ALT 7 I-5 • 4-Lane, ZE/NZE Freight Corridor • Modernization: Reconfigure Interchanges and Add Auxiliary Lanes • No Additional Through Lanes Corridor ZE/NZE Strategies: • Truck Commercialization • Incentive Programs • Exposure Reduction Programs I-105 SR-91 Del Amo I-405 Freight Corridor Lanes Freight Corridor Ramps General Purpose Lane Auxiliary Lane / Ramp SR-1 Freeway Interchange Geometric Redesign Local Interchange Geometric Redesign Minor Local Interchange Improvement Shoemaker Bridge OCEAN 15
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