A Rational Procedure for development of traffic distribution factors Harikishan Perugu, PTP Transportation Engineer/Planner OKI Regional Council of Governments Cincinnati, OH

Background o Traffic distribution factors are percentages of daily traffic  Hourly distribution factors  Time of day factors  Truck factors o Used for –Model Validation –Post Processing Energy consumption User Cost analysis Highway Congestion Emissions

Procedure Collect Data –Detailed traffic counts (lots of locations!!) –Land use data –Highway network data Process Data –Convert to same format –Calculate – AM peak direction percentages – Time of day factors – Truck percentages –Stratify counts based on area type, functional class –Plotting the graphs

Procedure (Continued) Analysis of Patterns –Manually stratify based on land use (used GIS) –Analyze average hourly factors –Analyze average truck factors –Statistical analysis for confidence interval (t-statistic)

Example

Conclusion Major factors affecting hourly distribution Land use (Retail, industrial, residential), roadway functional class Land use mix is manual process Major factors affecting truck distribution Land Use (Industrial Vs Non Industrial) Freeway Vs Non freeway GIS information yielded better factors Not Similar to State wide factors

Thank you & Questions Contact Info: Andrew Rohne Data Services Manager OKI Regional Council of Governments Cincinnati, OH or Harikishan Perugu