CE576: Highway Design and Traffic Safety
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1 CE576: Highway Design and Traffic Safety Predicting Crash Frequency for Two-Lane Rural Highway Segments Cross Sectional Elements Ahmed Abdel-Rahim, Ph.D., P.E. Civil Engineering Department University of Idaho National Institute for Advanced Transportation Technology 2-2 What should you expect would be the safety and operational influence of cross sectional elements? Crashes Operations Lane Width Head-on Capacity Shoulder Width Sideslope Clear Zone Wider is better Run-off-Road Wider is better Run-off-road (severity) Flatter is better Run-off-road (frequency and severity) Wider means faster Capacity Functionality (peds, bikes, emergency stops, capacity, maintenance) Maintenance Flatter is better Horizontal sight distance 2-3 Functions of shoulders in a rural environment Clear zone (recovery) Highway Capacity Clear zone (horizontal sight distance) Store vehicles in emergency Pedestrians, bicyclists Protection for turns off the roadway Provide pavement support Store snow Provide space for maintenance activities Enforcement activities 2-4 1
2 Key Findings of FHWA Cross Section Study on Two-Lane Hwys (Zegeer) Traffic volume influences crash rate Both lane and shoulder width have influence Roadside Hazard next biggest influence on crashes Alignment affects cross section crashes (terrain is surrogate for alignment) 2-5 Crash Severity for Two-Lane Rural Highways Rural 2 Lane Highway Segment Severity Ratio = 32.1% for Injury + Fatal Crashes 2-6 HSM Crash Prediction: 18 Steps for Two-Lane Rural Roadways Rural Area Definition: Places outside urban boundaries Populations of 5,000 persons, or less Applicable to: Existing Roadways Design Alternatives for existing or new roadways 2-7 Predicting Crash Frequency Performance - Analysis Sections Organizing information for Safety Analysis: Separate project lengths (and crashes) into homogeneous units: Average daily traffic (AADT) volume (vehicles/day) Lane width (ft) Shoulder width (ft) Shoulder Type Driveway Density (driveways per mile) Roadside Hazard Rating Beginning/End of Horizontal Curves Beginning/End of Segments on Grade (>3%) 2-8 2
3 Subdividing Roadway Segments Homogeneous Roadway Segments: Lane Width Subdividing Roadway Segments Homogeneous Roadway Segments: Shoulder Width HSM Crash Prediction Method Three Basic Elements: 1. Safety Performance Functions (SPF) Equations Predict safety performance for set base conditions 2. Crash Modification Factors (CMFs) Adjust predicted safety performance from base conditions to existing/proposed conditions Are greater or less than 1: < lower crash frequency > increased crash frequency 3. Calibration, C r or C i Accounts for local conditions/data 2-11 HSM Crash Prediction Method Total estimated crashes within the limits of the roadway being analyzed: N total = N predicted-rs + N predicted-int N total = Total expected number of crashes within the limits of the roadway facility N predicted-rs = Expected crash frequency for all roadway segments (sum of individual segments) N predicted-int = Expected crash frequency for all intersections (sum of individual intersections)
4 Roadway Segment Prediction Model N predicted-rs = N spf-rs x (CMF 1r CMF xr ) C r N predicted-rs = predicted average crash frequency for an individual roadway for a specific year (crashes per year) N spf-rs = predicted average crash frequency for base conditions for an individual roadway segment (crashes per year) CMF 1r... CMF xr = Crash Modification Factors for individual design elements C r = calibration factor 2-13 Safety Performance Function (SPF) SPF for Two-Lane Rural Highway Segment Crashes for Base Conditions: N spf-rs = predicted total crash frequency for a roadway segment for base conditions, crashes per year AADT n = average annual daily two-way traffic volume for specified year n (veh/day) L = length of roadway segment (miles) 2-14 Base Conditions for Rural Two-Lane Roadway Segments (CMF = 1.0) Lane Width: 12 feet Shoulder Width: 6 feet Shoulder Type: Paved Roadside Hazard Rating: 3 Driveway Density: <5 driveways/mi Grade: <3%(absolute value) Horizontal Curvature: None Vertical Curvature: None Centerline rumble strips: None TWLTL, climbing, or passing lanes: None Lighting: None Automated Enforcement: None 2-15 Safety Performance Function (SPF) Applying SPF for Base Conditions Example: 2-lane state highway connecting a US marked route to a primary State marked route in a rural county; AADT = 3,500 vpd Length = 26,485 feet = 5.02 miles
5 Safety Performance Function (SPF) Applying SPF for Base Conditions Example: AADT = 3,500 vpd Length = 26,485 feet = 5.02 miles N spf-rs = (3,500) (5.02) (365) (10-6 ) e = (3,500) (5.02) (365) (10-6 ) (0.7320) = 4.69 crashes per year
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