The emission factors if transportation emission contribution into a system/process is based on distance traveled.
Emission factors are listed in the Directive Directive 2003 /87 / EC. , Or CORINAIR guide environmental agency EPA.www.eea.europa.eu
If you are interest on UK emissions factors the following website maybe of interest for you.
http://naei.defra.gov.uk/data/ef-transport
I suggest you to read " Transportation Decision Making: Principles of Project Evaluation and Programming" By Sinha and Labi . It covers all details and you shall really enjoy reading this book.
http://www.amazon.com/Transportation-Decision-Making-Principles-Programming/dp/0471747327
The HBEFA application (http://www.hbefa.net/) allows to compute emissions given the driven distances.
you might want to check one of the VCS methodologies that list the emissions based on distance and harvested carbon (if forestry related). There are VCS methodlogies not related to forestry that can give you some coefficients. You might also try the IPCCC latest assessment report.
www.v-c-s.org
http://www.ipcc.ch/report/ar5/wg1/
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