Scale Project Level Domain Project Level Domain Project Level Domain Year 2015 2015 2015 Time Span- Month January January January Time Span - Hour 12:00 AM 12:00 AM 12:00 AM Time Span - Day Weekday Weekday Weekday Geographic Bounds Custom Domain Custom Domain Custom Domain Temperature -10° Fahrenheit -10° Fahrenheit -10° Fahrenheit Relative Humidity 100% 100% 100% Fuel Formulation Gasoline Formulation ID - Gasoline Formulation ID - Gasoline Formulation ID - – – – 3812 3812 3812 Diesel Formulation ID - Diesel Formulation ID - Diesel Formulation ID - – – – 20011 20011 20011 CNG Formulation ID - 30 CNG Formulation ID - 30 CNG Formulation ID - 30 – – – Fleet Mix Emission Source Type and Emission Source Type and Emission Source Type and Fuel Combinations for 2015 Fuel Combinations for 2015 Fuel Combinations for 2015 with a Shift to 0% Heavy-Duty with a Shift to 0% Heavy-Duty with a Shift to 0% Truck Volumes to Reflect Truck Volumes to Reflect Truck Volumes to Higher CO emission Rates Higher CO emission Rates Reflect Higher CO emission from Gasoline Vehicles (refer from Gasoline Vehicles (refer Rates from Gasoline Vehicles C4 C4 C4 to Table through Table C6) to Table through Table C6) (refer to Table through Table C6) Age Distribution 2015 National Default 2015 National Default 2015 National Default Link Source Type Variable - on 2015 Variable - Based on 2015 Variable - Based on 2015 Distribution National Default VMT for National Default VMT for National Default VMT for Urban Restricted Access Road Urban Unrestricted Access Urban Unrestricted Access Type Road Type Road Type Road Type Urban and Rural Restricted and Rural Unrestricted Urban and Rural Access Access Unrestricted Access Link Average Speed 74 mph 45 mph 15, 25 and 35 mph approach and idle (intersection) Grade ±7% , ±4%, ± 2%, ± 0% (uphill ±4%, ± 2%, ± 0% (uphill and ± 2% (cross direction) and 0% and downhill grade) downhill grade) grade in other direction (intersection) Inspection & Maintenance None None None C-4.1.1 Relative Humidity A value of 100% relative humidity was used for the emission modeling. It is important to note that for temperatures of 75 degrees Fahrenheit and below, relative humidity has no effect on CO emission rates.
Scale Project Level Domain Project Level Domain Project Level Domain Year 2015 2015 2015 Time Span- Month January January January Time Span - Hour 12:00 AM 12:00 AM 12:00 AM Time Span - Day Weekday Weekday Weekday Geographic Bounds Custom Domain Custom Domain Custom Domain Temperature -10° Fahrenheit -10° Fahrenheit -10° Fahrenheit Relative Humidity 100% 100% 100% Fuel Formulation Gasoline – Formulation ID - 3812 Gasoline – Formulation ID - 3812 Gasoline – Formulation ID - 3812 Diesel – Formulation ID - 20011 Diesel – Formulation ID - 20011 Diesel – Formulation ID - 20011 CNG – Formulation ID - 30 CNG – Formulation ID - 30 CNG – Formulation ID - 30 Fleet Mix Emission Source Type and Fuel Combinations for 2015 with a Shift to 0% Heavy-Duty Truck Volumes to Reflect Higher CO emission Rates from Gasoline Vehicles (refer to Table C4 through Table C6) Emission Source Type and Fuel Combinations for 2015 with a Shift to 0% Heavy-Duty Truck Volumes to Reflect Higher CO emission Rates from Gasoline Vehicles (refer to Table C4 through Table C6) Emission Source Type and Fuel Combinations for 2015 with a Shift to 0% Truck Volumes to Reflect Higher CO emission Rates from Gasoline Vehicles (refer to Table C4 through Table C6) Age Distribution 2015 National Default 2015 National Default 2015 National Default Link Source Type Distribution Variable - on 2015 National Default VMT for Urban Restricted Access Road Type Variable - Based on 2015 National Default VMT for Urban Unrestricted Access Road Type Variable - Based on 2015 National Default VMT for Urban Unrestricted Access Road Type Road Type Urban and Rural Restricted Access and Rural Unrestricted Access Urban and Rural Unrestricted Access Link Average Speed 74 mph 45 mph 15, 25 and 35 mph approach and idle (intersection) Grade ±7% , ±4%, ± 2%, ± 0% (uphill and downhill grade) ±4%, ± 2%, ± 0% (uphill and downhill grade) ± 2% (cross direction) and 0% grade in other direction (intersection) Inspection & Maintenance None None None C-4.1.1 Relative Humidity A value of 100% relative humidity was used for the emission modeling. It is important to note that for temperatures of 75 degrees Fahrenheit and below, relative humidity has no effect on CO emission rates.
NCHRP25-25(78)_AppendixC.docx