NCHRP : Unsignalized Intersection Improvement Guide (UIIG) Presentation at the Mid-Colonial ITE 2015 District Meeting
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1 NCHRP : Unsignalized Intersection Improvement Guide (UIIG) Presentation at the Mid-Colonial ITE 2015 District Meeting
2 NCHRP Project Problem statement: Develop comprehensive guide to enhance safe operation for all users of unsignalized intersections Should be practical and multimodal and aid practitioners in selecting design, operational, maintenance, enforcement, and other types of treatments to improve safety, mobility, and accessibility NCHRP Projects Engineer Ray Derr
3 What is an unsignalized intersection? Any at-grade junction of two or more public roads whose traffic movements are not controlled by a traffic signal interchanges signals
4 Unsignalized intersection types UIIG typology based on type of control: i. Uncontrolled no traffic control devices ii. Yield control one or more approaches controlled by a YIELD sign* iii.stop control one or more approaches controlled by a STOP sign * Includes roundabouts, mini-roundabouts, and residential traffic circles
5 Impetus for developing the UIIG Recognition of nationwide safety issue In 2012, more than 70 percent of all intersectionrelated fatal crashes in the US involved unsignalized intersections Recognition of local road/local agency problem The majority of unsignalized intersections are owned and operated by local agencies most of which do not have professional traffic engineers on staff
6 Benefits of web-based UIIG Allows continuous revisions (e.g., MUTCD updates, new information, corrections) Enables user interaction more likely to be used Offers hyperlinks to other internet resources that provide additional information on a variety of intersection-related topics Capitalizes upon internet-based innovations such as aerial imagery and street-level photography to illustrate real-world examples
7 UIIG structure two main sections
8 UIIG Information Intersection traffic control: Uncontrolled Yield-controlled Stop-controlled
9 UIIG Information Three primary user groups: Motorists Bicyclists Pedestrians
10 UIIG Information IMPROVEMENT PROCESS 1) Identify problem location 2) Analyze location to characterize problem 3) Identify potential treatments that may address problem 4) Select/implement most affordable cost-effective treatment 5) Monitor and evaluate effectiveness over time
11 UIIG Information UIIG PROBLEM TYPES 1. Inappropriate intersection traffic control 2. Inadequate visibility of intersection or regulatory TCDs 3. Inadequate intersection sight distance 4. Inadequate guidance for motorists 5. Excessive conflicts within or near the intersection
12 UIIG Information UIIG PROB. TYPES (cont.) 6. Vehicle conflicts with nonmotorists 7. Poor operational performance 8. Misjudgment of gaps in traffic 9. Speeding 10. Non-compliance with intersection TCDs
13 UIIG Information Engineering treatments: TCDs Geometric treatments Shoulder/roadside Pavement surface Other engineering Enforcement Education
14 UIIG Information References MUTCD, Uniform Vehicle Code Discusses thresholds and considerations when varying levels of control may apply: No control Yield-control Stop-control All-way stop-control
15 UIIG Information Traffic signs Regulatory Warning Guide Pavement markings Pedestrian TCDs
16 UIIG Information
17 UIIG Information
18 UIIG Information Access management Alternative intersections Crash data & analysis Design FHWA ISIPs Human factors Intersection case studies Non-motorized users Operations Road Safety Audits Rural roads Traffic Calming Types of Drivers
19 UIIG structure two main sections
20 UIIG Toolkit Provides example/starting point for inviting and accepting feedback from general public on perceived issues concerning an agency s road network
21 UIIG Toolkit Lists variety of data elements related to physical/operational characteristics of an unsignalized intersection Provides an interface through which data can be entered and cataloged Ten data entry tabs Most elements are optional Final tab compiles all data inputs in a single table
22 UIIG A&I form Geometry tab
23 UIIG Toolkit: Treatment Selection Tool UIIG provides 1-page fact sheets for 75 treatments 71 engineering treatments 4 enforcement treatments
24 UIIG treatment fact sheet PDFs Targeted crash types Problem types addressed Description Conditions addressed Photographs Relevant MUTCD/ Green Book sections Link to CMF Clearinghouse website Considerations for installation Links to external resources Link to internet mapping of several actual applications
25 UIIG Toolkit: Treatment Selection Tool Tool offers four ways for users to access treatment alternatives
26 UIIG Toolkit filter questions Users can answer up to 6 questions regarding their intersection of interest to obtain a tailored list of treatment alternatives 1. Area type 2. Major road ADT 3. Major road approach lanes 4. Targeted crash type(s) 5. Potential problem type(s) 6. Treatment type(s)
27 UIIG Toolkit filter example UIIG Data Prompt User Input Area type Rural Major road ADT -- Major road approach lanes Single lane Targeted crash type(s) -- Potential problem type(s) Inadequate sight distance Treatment type(s) --
28 UIIG Toolkit alternatives matrix Users can view treatment alternatives associated with any UIIG Problem Type/Treatment Type combination
29
30 UIIG Toolkit
31 UIIG Toolkit Option to search only the treatment sheets OR the entire UIIG website Example pedestrian
32 UIIG Toolkit List of all 75 UIIG treatments by type: TCDs Geometric improvements Roadside/shoulder Pavement surface Other engineering Enforcement
33 UIIG feedback Questions/comments can be submitted via website Feedback will be logged and reviewed by expert panel
34 UIIG website today and what s next Final Draft under review by NCHRP Oversight Panel Upon completion, UIIG is to be hosted by the Institute of Transportation Engineers (ITE) Free public access to website Staff will maintain/administer website Membership will comprise technical committee to oversee site revisions (in conjunction with FHWA) FHWA intends to sponsor UIIG website Website URL to be determined
35 UIIG authors and developers As prime contractor, VHB was supported by: Lee Engineering, LLC (Mike Cynecki, Yung Koprowski) ITE Independent consultants Tony Giancola Capt. Glenn Hansen Frank Spielberg Key VHB staff: Technical content Website and toolkit development Hugh McGee, PI Eric Vierra Jon Soika Jason Nicholson Becky Fiedler Gaetan Siry Anne Holzem Matt Albee
36 Thank you
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