Florida s Intersection Safety Implementation Plan (ISIP)
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1 Florida Department of TRANSPORTATION Florida s Intersection Safety Implementation Plan (ISIP) Alan El-Urfali, PE State Traffic Engineering and Operations Office March 28, 2017
2 Intersection Safety Implementation Plan Background What is an ISIP? ISIP Project Screening Process Proposed ISIP Systematic Implementation Intersection Control Evaluations (ICE) Design standards Discussion
3 Background Florida s Strategic Highway Safety Plan
4 Background From 2011 to 2015: 17% Increase in Fatalities 4% in Serious Injuries Intersections So why focus on intersections? Locations that pose the greatest risk to any user. The one place where all road users and vehicle types come together. A point of conflict that relies on signage, traffic control devices, roadway design and good behavior of users to operate safely. Pedestrians and bicyclists account for more than 17 percent of the fatalities at intersections. Intersections create risks for aging road users because as people age, there are declines in visual, cognitive, and physical abilities. 4
5 Background Moving towards a fatality-free roadway system requires reevaluating current process for determining intersection improvements. FDOT s Intersection Safety Coalition formed Implementation strategy identified: Reduce frequency & severity of intersection crashes by limiting conflicts through geometric, traffic control and lighting Institute Highway Safety Manual (HSM) analyses and road safety audits to make improvements for all users Use traditional and alternative designs & technologies to reduce conflict risks such as innovative intersection designs, access management and roundabouts Improve awareness and visibility of traffic control devices so all users can safely navigate intersections
6 What is an ISIP? Intersection Safety Implementation Plan (ISIP) identifies key steps, responsibilities, estimated funding requirements, and estimated injuries and fatalities prevented annually. The Florida ISIP will have: Intersection Control Evaluations (ICE) for top ranked intersections Selection of low-cost countermeasures Development new standards and guidelines
7 What is an ISIP? Intersection Control Evaluations (ICE) A new FDOT policy and procedure implementing a consistent and objective intersection evaluation process that is built upon performance-based criteria for determining the best value geometric design and traffic control for a given intersection/interchange. Planned to be adopted July 1, 2017
8 ISIP Project Screening Process Candidate Intersections are identified based on AASHTO Highway Safety Manual (HSM) methodologies Predictive method using network (statewide) screening process called Excess Expected Crash Frequency Intensive data collection effort Start with state highway system intersections first, then include off system, local intersections.
9 ISIP Project Screening Process Highway Safety Manual (HSM) AASHTO s guide for analyzing transportation safety Provides guidance on conducting predictive method crash analysis given various condition variables Includes Safety Performance Functions (SPFs) which help establish expected crash frequencies for given conditions/variables Used as a foundation for establishing ICE analysis tools and performance criteria 9
10 ISIP Project Screening Process Intersections will be grouped or categorized according to HSM criteria: Rural or Urban 2-lane or multi-lane Divided or undivided Signalized or stop control 3-leg or 4-leg Ranked based on highest crashes resulting from the Excess Expected Crash Frequency screening process
11 Proposed ISIP Implementation Intersection Control Evaluation (ICE) Component: Top ranked intersections based on excess expected crash frequency Perform ICE for top ranked intersections Implement intersection improvements based on ICE results (Identified Innovative Intersection Control Types) Low Cost Improvements Component: Creating new design standards and guidelines Innovative signing and marking standards
12 Proposed ISIP Implementation Examples of Innovative ICE results: Result of ICE process will be a list of innovative intersection types that will be programed Most common innovative intersections: Roundabouts Signalized Restricted Crossing U-Turn (R-CUT) Displaced Left-Turn Diverging Diamond
13 Proposed ISIP Implementation Examples of Innovative ICE results: Roundabouts
14 Proposed ISIP Implementation Examples of Innovative ICE results: RCUT
15 Proposed ISIP Implementation Examples of Innovative ICE results: Displaced Left-Turn
16 Proposed ISIP Implementation Examples of Innovative ICE results: Diverging Diamond
17 Proposed ISIP Implementation Examples of Low-Cost Standards: Stop control enhancements (doubled up signage)
18 Proposed ISIP Implementation Examples of Low-Cost Standards: Led Blank-Out Signs
19 Proposed ISIP Implementation Examples of Low-Cost Standards: Intersection Conflict Warning Systems (ICWS)
20 Proposed ISIP Implementation Examples of Low-Cost Standards: Internally Illuminated Reflective Pavement Markers (IIRPM)
21 Proposed ISIP Implementation Examples of Low-Cost Standards: Flashing Yellow Arrow standards
22 Discussion Questions?
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