[PDF] Examining The Effects Of Variability In Average Link Speeds On Estimated Mobile Source Emissions And Air Quality eBook

Author : John Sanders Miller
Publisher :
Page : 27 pages
File Size : 15,25 MB
Release : 2002
Category : Air quality
ISBN :

GET BOOK

A speed post-processor refers to equations or lookup tables that can determine vehicle speeds on a particular roadway link using only the limited information available in a long-range planning model. An estimated link speed is usually based on volume, the percentage of heavy trucks, the free flow speed on the link, and the facility type (e.g., interstate, two-lane highway). These post-processed speeds are used to estimate motor vehicle emissions in conjunction with the U.S. Environmental Protection Agency's MOBILE model. At least two post-processors in the form of software packages are available to VDOT staff. One, developed by Michael Baker Jr., Inc., can be used immediately with minor modifications as an interim measure to perform conformity analyses for new nonattainment areas. The other is being updated by VDOT's Northern Virginia District; a new generation is expected within a few months. Another option is for VDOT staff to code speed-volume equations directly into a spreadsheet, as has been done in the Appendix. The authors recommend that over the next 12 months, either the Research Council, VDOT, or the two organizations work together to validate the post processors available by comparing their computed and actual speeds on a variety of facility types. In conjunction with this effort and to the extent that resources allow, the effect of different input data, such as vehicle age, vehicle type, and travel speeds, on mobile source emissions as predicted by the MOBILE model should be studied.

Author : Tim Ryley
Publisher : Emerald Group Publishing
Page : 409 pages
File Size : 17,50 MB
Release : 2012-07-17
Category : Political Science
ISBN : 1780524412

GET BOOK

This topical volume covers the intersection between transport and climate change, with papers from the 'Transport & Climate Change' session of the RGS-IBG conference in London, September 2010. It considers the role of transport modes at varying spatial dimensions and a range of perspectives on the relationship between transport and climate change.

Author : Wayne R. Ott
Publisher : CRC Press
Page : 554 pages
File Size : 28,54 MB
Release : 2006-10-26
Category : Medical
ISBN : 1420012630

GET BOOK

Written by experts, Exposure Analysis is the first complete resource in the emerging scientific discipline of exposure analysis. A comprehensive source on the environmental pollutants that affect human health, the book discusses human exposure through pathways including air, food, water, dermal absorption, and, for children, non-food ingesti