Major Contributing Factors

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Daniella Anderson
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1 Major Contributing Factors Contents: Page Figure.1 Major Contributing Factors by Collision Severity 16.2 Major Contributing Factors in Collisions by Road System 19 Table.1 Alcohol, Speed and Distraction in Fatal Collisions 14.2 All Major Contributing Factors in Fatal Collisions 15. Count of Factors by Severity 16.4 Count of Factors by Severity 16.5 Count of Vehicle Factors by Severity 17.6 Count of Factors by Severity 17.7 Count of Factors by Road System 18.8 Count of Factors by Road System 18.9 Count of Vehicle Factors by Road System 18.1 Count of Factors by Road System 19 1

2 Major Contributing Factors Contributing factors are those circumstances or factors that have directly contributed to the collision or its severity. TAIS recognizes that a collision usually results from many causal factors. The collision data system accepts up to four contributing factors for each vehicle involved in a collision. Factors can be selected from four categories: human condition, human action, vehicle condition, and driving environment. In traffic collisions reported by police agencies, the causal factors are assigned by the investigating officer. Incidents reported through SGIʼs Dial-A-Claim or Auto eclaim are assigned causal factors only if they are clearly identified in the driversʼ statements. The causal factors in property damage only collisions are therefore much more subjective in nature and not directly comparable to previous years and casualty collisions. This section summarizes all contributing factors that were reported. In 216, a total of 46,857 factors contributed to 29,6 collisions. With the exception of Table.1, the numbers in following tables and figures represent the number of occurrences of each factor. Figure.1 shows that human condition is a more prevalent factor in fatal collisions (49%) than in all collisions (6%). condition and human action account for 68% of all factors in collisions, as compared to 84% of factors in fatal crashes. Figure.2 summarizes the factors by road system. factors contribute to 77% of urban collisions, while environmental conditions, mainly animal actions, are more prevalent in rural and highway collisions (64% and 71%). Top 1 Contributory Factors in Fatal Collisions During 216 Table.1 Driver/Vehicle/ Factors Urban Streets Provincial Highways Rural Roads Other % of Alcohol Involvement Distracted Driving Speed-Related Other Fail to Yield/Traffic Control Disregarded Following Too Closely Other s Careless Driving/Stunting Driver Inexperience/Confusion Pedestrian Action Contributed * A collision can have a maximum of four contributing factors for each vehicle involved. 1 Alcohol involvement collisions involve drivers who have been coded as ʻHad Been Drinkingʼ or ʻImpairedʼ. 2 Distracted driving collisions involve drivers who have been coded as ʻInattentiveʼ or ʻDistractedʼ. Speed-related collisions involve drivers who have been coded as ʻDriving Too Fast for Road sʼ or ʻExceeding the Speed Limitʼ. 14

3 All Major Contributing Factors In 216 Fatal Collisions Table.2 Urban Provincial Rural Driver/Vehicle/ Factors Streets Highways Roads Other % of Alcohol Involvement Distracted Driving Speed-Related Other Fail to Yield/Traffic Control Disregarded Following Too Closely Other s Careless Driving/Stunting Driver Inexperience/Confusion Pedestrian Action Contributed Weather s 8 8. Passing or Improper Lane Usage Drugs (Prescription or Illegal) Taking Evasive Action Animal Action (Wild). Other 1. Lost Consciousness/Other Illness. Fell Asleep 1. Snow Drift. View Obstructed/Limited 1. Physical/Medical Disability Defective Tires/Tire Blowout. Other Vehicle /Defect Lane Marking Inadequate. Defective Exhaust System. Extreme Fatigue Turning Improperly Alcohol involvement collisions involve drivers who have been coded as ʻHad Been Drinkingʼ or ʻImpairedʼ. 2 Distracted driving collisions involve drivers who have been coded as ʻInattentiveʼ or ʻDistractedʼ. Speed-related collisions involve drivers who have been coded as ʻDriving Too Fast for Road sʼ or ʻExceeding the Speed Limit'. 15

4 Major Contributing Factors by Collision Severity 6% Fatal Collisions Figure.1 25% Injury Collisions 1% Vehicle 2% 48% Vehicle 2% 49% 25% All Collisions.6% 1.8% Vehicle 1.6% 6% Count of Factors by Severity Driver Inattention Driver Inexperience/Confusion Driver Distraction Driving While Impaired Had Been Drinking Other s Fell Asleep Extreme Fatigue Drugs (Prescription or Illegal) Lost Consciousness/Other Illness Physical/Medical Disability Defective Eyesight/Hearing Property Damage 7, , , ,819 Personal Injury ,915 Table. Fatal ,94 94, , ,85 Count of Factors by Severity Fail to Yield Following Too Closely Driving Too Fast for s Taking Evasive Action Traffic Control Device Disregarded Other Passing or Improper Lane Usage Backing Unsafely Turning Improperly Careless Driving/Stunting Exceeding Speed Limit Pedestrian Action Contributed Fail to Signal Driving Wrong Way in One Way Traffic Property Damage 2,84 1,89 1, , ,28 16 Personal Injury ,578 % of Factors Table.4 Fatal ,27 2,775 1,448 1,12 1,52 1,89 1, ,9 % of Factors

5 Count of Vehicle Factors by Severity Table.5 Property Personal % of Vehicle Damage Injury Fatal Factors Other Vehicle /Defect Defective Tires/Tire Blowout Jackknife/Trailer Swing Defective Brakes Vehicle Overloaded/Improperly Loaded View from Vehicle Obstructed Load Shifted/Spilled Defective Suspension/Wheel Failure Defective Steering Defective Engine/Power Train/Wiring Defective Lights 5 8. Lights Not On Defective Exhaust System Count of Factors by Severity Table.6 Property Personal % of Damage Injury Fatal Factors Road (Surface or Structure) 2, , Animal Action (Wild) 6, , Weather s Uninvolved Vehicle View Obstructed/Limited Other Excessive Loose Gravel Snow Drift Sun Glare Uninvolved Pedestrian Animal Action (Domestic) Obstruction/Debris on Road Construction Zone Soft or Defective Shoulder Traffic Control Device Not Working Lane Marking Inadequate ,465 1, ,

6 Count of Factors by Road System Table.7 Urban Provincial Rural % of Streets Highways Roads Other Factors Driver Inattention 7, , Driver Inexperience/Confusion Driver Distraction, ,91 8. Driving While Impaired Had Been Drinking Other s 2, ,26 5. Fell Asleep Extreme Fatigue Drugs (Prescription or Illegal) Lost Consciousness/Other Illness Physical/Medical Disability Defective Eyesight/Hearing ,687 1, ,85 6. Count of Factors by Road System Table.8 Urban Provincial Rural % of Streets Highways Roads Other Factors Fail to Yield 2, , Following Too Closely 2, , Driving Too Fast for s ,448.1 Taking Evasive Action , Traffic Control Device Disregarded , Other 1, ,89 4. Passing or Improper Lane Usage ,6 2. Backing Unsafely Turning Improperly Careless Driving/Stunting Exceeding Speed Limit Pedestrian Action Contributed Fail to Signal Driving Wrong Way in One Way Traffic ,448 1, ,9 2 Count of Vehicle Factors by Road System Table.9 Urban Provincial Rural % of Vehicle Streets Highways Roads Other Factors Other Vehicle /Defect Defective Tires/Tire Blowout Vehicle Overloaded/Improperly Loaded Jackknife/Trailer Swing Defective Brakes View from Vehicle Obstructed Load Shifted/Spilled Defective Suspension/Wheel Failure Defective Steering Defective Engine/Power Train/Wiring Lights Not On Defective Lights Defective Exhaust System

7 Count of Factors by Road System Table.1 Urban Provincial Rural % of Streets Highways Roads Other Factors Road (Surface or Structure) 1, , Animal Action (Wild) 16 5,22 1, , Weather s Uninvolved Vehicle View Obstructed/Limited Other Excessive Loose Gravel Snow Drift Sun Glare Uninvolved Pedestrian Animal Action (Domestic) Obstruction/Debris on Road Construction Zone Soft or Defective Shoulder Traffic Control Device Not Working Lane Marking Inadequate ,668 7,42 2, ,72.7 Major Contributing Factors in Collisions by Road System Figure.2 Urban Streets Provincial Highways 4% 12% Vehicle 1% Vehicle % 1% 1% 47% 71% Rural Roads Other Roads 64% 16% 24% Action 19% Vehicle % Vehicle 14% % 57% 19

Draft Report: Traffic Crashes in the Denver Region

Click to edit Master title style Click to edit Master title style Draft Report: Traffic Crashes in the Denver Region Presented by: Steve Cook Board Nov. 16, 2016 Click Report Click to to edit on edit Master