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Weekend Effect Workshop: Analyzing Mobile Source Activity and Impacts on Emissions

The Weekend Effect Workshop, presented by Mark A. Carlock, focuses on the analysis of mobile source activity, particularly the variations in travel behavior and emissions between weekdays and weekends. Key theories to be explored include the carryover of precursors from Friday to Saturday, variation in activity levels among major contributors, and changes in the hydrocarbon to nitrogen oxide ratios. The workshop will review data from instrumental vehicle studies, travel surveys, and off-road activity, aiming to develop weekend activity profiles, assess urban air shed models, and project future emission control impacts.

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Weekend Effect Workshop: Analyzing Mobile Source Activity and Impacts on Emissions

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  1. WEEKEND EFFECT WORKSHOP Analysis of Mobile Source Activity Presented by: Mark A. Carlock

  2. Three Theories to be Analyzed • Carryover of Precursors from Friday to Saturday • Variation in Activity of Large Contributors • Variation in Ratios of Hydrocarbon to Oxides of Nitrogen

  3. Little Variation in Per-Vehicle Trips • Insturmented Vehicle Studies Show No Statistically Significant Difference in Per-Vehicle Trips • 6.1 Vs. 6.3 in Sacramento • 6.3 Vs. 6.0 in LA

  4. Constant Miles Per Trip • Insturmented Vehicle Data Averages: • 4.87 miles/trip Weekday • 5.33 miles/Trip Weekends

  5. Weekend Trips Slightly Faster

  6. Trips Occur Later on Weekends

  7. Fewer Vehicles Driven on Weekends • Total Weekday Trips • 96,052,000 • 18 Minutes/Trip • Total Weekend Trips • 78,532,000 • 20 Minutes/Trip • 1991 Statewide Caltrans Travel Survey

  8. A Newer Fleet in Motion on Weekends

  9. Highest VMT on Friday Later in Afternoon Newer Fleet on Weekends Lower Heavy Truck Traffic on Weekends More Vehicles Sitting on Weekends Carry Over Lower HC to NOx Lower NOx More Evaporative HC Summary of On-Road Activity

  10. Increased Lawn and Garden Equipment Use Increased Recreational Vehicle Use Decreased Construction and Light Industrial Higher HC Compared to NOx Higher HC Compared to NOx Decreased NOx Summary of Off-Road Activity

  11. Gasoline Sales Highest on Friday

  12. Other Assumed Contributors • Diesel Sales Lower on Weekend • Different Spatial Distribution of Activity • Increased Power Generation • Alteration in Air Traffic • Fast Food / Bar-B-Que • Gas Can Usage

  13. Research Project • Develop Weekend Activity Profiles for On-, and Off-Road Motor Vehicles • Generate Weekend/Seasonal Inventories • Exercise Urban Air Shed Models • Assess Model Performance • Project the Effect of Future Emission Controls on Ozone Formation • $500,000 - 18 Months

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