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Lesson 14 - On-Road Mobile Sources

14.2 - How to Calculate Vehicle Miles Traveled (VMT)

State Route 1 (SR1) is a 10 mile long stretch of rural highway,
On average, 100 cars (light duty gasoline vehicles or LDGVs) travel on the road every day

    Total LDGV VMT = 10 miles x 100 vehicles/day x 365 days/year = 365,000 vehicle miles/year

On average, 25 heavy duty diesel trucks (HDDV) travel SR1 each day.
    Total HDDV VMT = 10 miles x 25 vehicles/day x 365 days/year = 91,250 vehicle miles/year

Now we'll give an example of how to calculate emissions for the cars on SR1:
    Carbon Monoxide (CO) EF from MOBILE6 for cars on rural highways = 24.523 g/VMT (for this example)

Emissions Estimate =
    24.523 g/VMT x 365,000 VMT = 8,950,895 g of CO
    8,950,895 g / 907184.74(g/ton) = 9.867 tons per year CO emitted by cars on SR1 each year

You would have to get a separate CO emission factor from MOBILE6 to do the same kind of calculation for HDDVs CO annual emissions.

			

End of Lesson 14.2

			
Lesson 14.1 Lesson 14.3
	
	
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Last updated: April 6, 2006