Intersection Safety Improvement Toolbox Presented by: Steve Tindale, P.E., AICP July 29, 2004

Too Many People are Dying! Fix the Traffic Safety Problem.

Where Do You Want Me to Start?! Sure Buddy… Where Do You Want Me to Start?!

This is Not the time to analyze procedures.

Topics Not Covered: Collecting Geometric & Traffic Data Developing Crash Rate Categories Benefit-Cost Analysis/Crash Reduction Factors Specific Engineering Solutions One Size Fits All Methodology

Data Collection & Analysis For Improved Operations …Will Provide a General Approach to: Crash Data Collection Management of Crash & Related Data Analysis of Crash Data

Data Collection & Analysis For Improved Operations Complete Process In-Vehicle Data Capture Scanned Reports/ Validated Data Entry GIS Location

Data Collection: Complete Process 1st Response Agency Complete Hardcopy Form Onboard Data Entry GPS Data Validation ??? Scan Report Transcribe Hardcopy Heads-Up/Validated Data Entry Crash Report Image Archive Crash Database

Data Collection: In-Vehicle Data Capture 1st Response Agency Complete Hardcopy Form Onboard Data Entry GPS Data Validation ??? Scan Report Transcribe Hardcopy Heads-Up/Validated Data Entry Crash Report Image Archive Crash Database

Field Data Entry

Data Collection: Scanning Reports/Validated Entry 1st Response Agency Complete Hardcopy Form Onboard Data Entry GPS Data Validation ??? Scan Report Transcribe Hardcopy Heads-Up/Validated Data Entry Crash Report Image Archive Crash Database

Heads-Up/Validated Data Entry

Data Collection: Scanning Reports/Validated Entry 1st Response Agency Complete Hardcopy Form Onboard Data Entry GPS Data Validation ??? Scan Report Transcribe Hardcopy Heads-Up/Validated Data Entry Crash Report Image Archive Crash Database

Data Collection: GIS Location Crash Data Link Exact Location Roadway Identifier Crash Database

Data Collection & Analysis For Improved Operations Management Merging State Data Managing Related Data Transitioning GIS Systems

Data Management: Merging State/Data Pros Reduces Data Entry Effort/$$ Standardized Database Cons Delay Dependency Local Data Collection Enhanced State Data

Data Management: Managing Related Data Traffic Signals

Data Management: Managing Related Data Speed Limit

Data Management: Managing Related Data Traffic Volume

Data Management: Managing Related Data Number of Lanes

Data Management: Managing Related Data Source/Maintained By Data Collection/Data Entry Sheriff's Office Signs, Markings, Assets Traffic Services Division – Asset Mngt. System Traffic Volume (Annual Counts) Planning and Growth Management Traffic Volume (Study-Specific) Traffic Services Division – Traffic Count DBase Traffic Control/Geometrics Traffic Services Division – Syncro/Asset Mgmt. Demographic US Census Department Land Use Aerial Imagery Survey and Mapping/Property Appraiser Photo Log GIS Data Information Services Department Data Collection Sheriff’s Office GIS Data Information Services Dept.

Data Management: Managing Related Data Source/Maintained By Data Collection/Data Entry Sheriff's Office Signs, Markings, Assets Traffic Services Division – Asset Mngt. System Traffic Volume (Annual Counts) Planning and Growth Management Traffic Volume (Study-Specific) Traffic Services Division – Traffic Count DBase Traffic Control/Geometrics Traffic Services Division – Syncro/Asset Mngt. Demographic US Census Department Land Use Aerial Imagery Survey and Mapping/Property Appraiser Photo Log GIS Data Information Services Department Do The Best You Can With What You’ve Got Aerial Imagery Is a Great Substitute

Data Management: Transitioning GIS Systems Node/Offset XY Coordinate Linear Reference

Data Management: Transitioning GIS Systems Node/Offset On Street @ Intersection of Location Type Data Distance & Direction From Intersection Requires Post Processing to Map

Data Management: Transitioning GIS Systems XY Coordinate Uses GPS to Capture Exact Location Requires Post Processing to Associate Other Data Works Well With In-Vehicle Data Capture

Data Management: Transitioning GIS Systems Linear Reference Difficult to Assign in Field Easy Association with Asset Data Requires Post Processing to Group Crashes

Data Collection & Analysis For Improved Operations Normalizing Data Intersection Analysis GIS Analysis

Analysis: Normalizing Data What is an “Abnormal” Intersection? State/Federal Region/Jurisdiction Region/Jurisdiction Corridor/Area Corridor/Area Individual Location

Florida Highway Safety Matrix 2002 Hillsborough County Total Fatalities and Injuries Alcohol Related Bicycle Fatalities and Injuries Motorcycle Fatalities and Injuries Pedestrian Fatalities and Injuries Speed Related Safety Equipment Rank 2 1 4 7 4 5 3 Top Five In All Categories Except Motorcycle Compared to Counties with Population Greater than 200,000

Crash Rates per 100 Million VMT

Injury Rates per 100 Million VMT

Fatality Rates per 100 Million VMT

Pedestrian Fatality Rates per 100,000 Population

Bicycle Fatality Rates per 100,000

Alcohol Related Fatality Rates per 100 Million VMT

Analysis: Normalizing Data Distribution of Crashes By Age State County Less Than 10% County & Corridor Greater Than 25% Corridor

Analysis: Normalizing Data First Harmful Event (Rear End Crashes) State County Corridor

Analysis: Normalizing Data First Harmful Event (Rear End Crashes) 28% 42% State 73% Corridor Intersection

Analysis: Intersection Now that we know what’s expected, what is extraordinary?

Intersection Analysis: Annual Trend Year Increase from 4 to 16

Intersection Analysis: Month Trend

Intersection Analysis: Daily Trend Day of Week

Intersection Analysis: Hourly Trend Hour of Day

Analysis: Intersection Collision Diagram Significant Pattern

GIS Analysis: Identify Crash Patterns Disregarded Traffic Signal Apply

GIS Analysis: Identify Crash Patterns Intersections With Red Light Running Crashes Disregarded Traffic Signal

GIS Analysis: Review Specific Crashes Crash ID# Information About Specific Crash Specific Crash Arrow needed?

Hillsborough Ave./Bike-Ped Crashes Bicycle Pedestrian Need aerial with crash info from Demian

GIS Analysis: Other Applications Relate Asset/Traffic Operations Data Relate Demographic Data Automobile Ownership vs. Bike/Ped Crashes Driver/Pedestrian Age Relate to Land Use Data Special Generators School Safety Bars/Nightclubs

Summary Collection Management Analysis

Contacts/Resources ITE Web Site ITE Review and Comment www.ite.org ITE Review and Comment www.ITE.org/safety/toolbox.htm FHWA Office of Safety Website for Training and Education: http://safety.fhwa.dot.gov/training/index.htm

The End