Analysis of Traffic Accident Data in Guadalupe and Commonwealth Sectors: Factors Influencing Road Incidents

1. METHODOLOGY DATA COLLECTION Guadalupe/Commonwealth Traffic Sector Data Parameter Within Parameter Outside Parameter Reject Data Exposure Exposure Vehicle Type Vehicle Type Driver Error Driver Error Environmental Factor Environmental Factor • Motorcycle • Tricycle • Car • Jeepney • Bus • Truck(Rigid) • Truck Arctic) • Van • Others • Motorcycle • Tricycle • Car • Jeepney • Bus • Truck(Rigid) • Truck(Arctic) • Van • Others • Fatigue/Asleep • Inattentive • Too Fast • Too Close • No Signal • Bad Overtaking • Others • Fatigue/Asleep • Inattentive • Too Fast • Too Close • No Signal • Bad Overtaking • Others Lighting Lighting Surface Condition Surface Condition Daylight Dawn/Dusk Night (Lit) Night (Unlit) Daylight Dawn/Dusk Night (Lit) Night (Unlit) Dry Wet Muddy Flooded Others Dry Wet Muddy Flooded Others Case Control

2. METHODOLOGY DATA COLLECTION

3. METHODOLOGY METHODS TO MINIMIZE POTENTIAL BIASES • Rater bias • Official accident reports filled up by designated police investigators who have underwent the Traffic Accident Investigation Course • Consider the investigator • Instrument bias • DPWH-crafted police report

4. METHODOLOGY METHODS TO MINIMIZE SOURCES OF ERROR • EDSA and Commonwealth have similar characteristics, such as the same types of vehicles that run through them, the same number of lanes and volume of traffic • Data collection methods were standardized

5. METHODOLOGY DATA ANALYSIS • Odds ratio between the outcome and each of the available exposure factors • Ranked in order to determine which exposure factor has the greatest correlation with the outcome

6. METHODOLOGY SCOPE AND LIMITATIONS • Time period: 1 January 2009 to 31 December 2009. • Non-fatal vehicle-to-vehicle accidents under the jurisdiction of the Guadalupe Traffic Sector (for EDSA) and the Commonwealth Traffic Sector (for Commonwealth) • Primary data source: Official accident reports made by trained traffic police investigators in the Guadalupe and Commonwealth Traffic Sectors

7. METHODOLOGY ETHICAL CONSIDERATIONS • The use of the data from the official accident reports solely for the purposes of the study • The protection and right to privacy of the identities of the parties involved in the accidents described in the accident reports

8. METHODOLOGY PLAN FOR DISSEMINATION OF RESULTS • Presented to the general academic community • A copy of the study output will be given to the MMDA and to other traffic-related bodies • Used as a reference for preventive interventions against possible fatal and untimely accidents along major roads and highways

9. METHODOLOGY TIMETABLE

10. METHODOLOGY BUDGET