DDI Presentation

UDOT DDILessons Learned Bangerter Hwy & SR-201 May 9, 2012 H.G. Kunzler – Lochner Nicole Williams - Lochner

Bangerter Hwy & SR-201 DDIBenefits:• Reduced total delay and stops by 41% • Improve 2020 LOS from E to C (WB ramps)• Utilized existing structure vs. full reconstruct• Improved safety (reduced conflict points)• Cost effective solution – • Bangerter Hwy & SR-201 ($2.8M)

Bangerter Hwy & SR-201 DDI Design Considerations: • Design Speed: 10 mph less through DDI • Bangerter Hwy = 50 mph, DDI = 40 mph • Low speed urban used • Cross Angle: 30 degree (minimum) • 30 degrees • Ramp/ Crossover Spacing: adequate for storage • 824 feet • Lane Width: turning radiusSource: UDOT DDI Guidelines

Bangerter Hwy & SR-201 DDI Operational Analysis Guidelines: • DDI fails if PHV (A,B,C) is > 2100 vph (4 thru lanes) • A= 550 vph, B= 1400 vph, C= 2800 vph (3 turn lanes, 5 thru lanes) • Sum of 2 of 3 not exceed 1900 vph (4 thru lanes) • LOS C (not typical D/E) • 2020 No Build LOS E (LOS F – NBL, SBT), PI = 299 • 2020 Build LOS C (No LOS F), PI = 175

DDI Signal Guidelines• Combined Signal Pole & Mast Arm• Directional Arrows• Right Turn Signal• Detection Cable

DDI Signing GuidelinesSource: UDOT DDI Guidelines • Directional Arrow Sign by Signal Head • Sign clutter – Critical Signs Only • Powder Coat back of Signal Heads

DDI Striping Guidelines • Directional Arrow at Stop Bar • Dotted Lines through Crossover • Grooved in Pavement Markings in Concrete /Reduced Maintenance

Bangerter Hwy & SR-201 DDIBangerter Hwy & SR-201, UtahI-44 & SR 13 in Springfield, Missouri

DDI Glare Screen Guidelines

Bangerter Hwy & SR-201 DDILessons Learned:Design Issues: Signing & Striping:• Cross slope • Reduce sign clutter – critical only• Vertical/ horizontal curves • Lane width/turning movement• Low speed urban design radii• Pedestrians • Dotted lines through crossover• Glare screens vs. sight distance • Directional Arrow at Stop Bar

Bangerter Hwy & SR-201 DDILessons Learned: Signal: • One signal pole / mast arm • Directional arrow sign by signal head

Bangerter Hwy & SR-201 DDILessons Learned: Construction: Maintenance: • MOT • Grooved in pavement markings • Public Education • Snow removal • Installation of • Curb painting / glare screen detection cable repair • Signal timing – simulate

Bangerter Hwy & SR-201 DDI

Bangerter Hwy & SR-201 QUESTIONS?

DDI Presentation

by Utah Department of Transportation on May 25, 2012

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