If your scope of the work permits, you may also want to consider the
transportation accessibility/network when estimating auto-ownership. This
could be a major factor for areas with good transit access or other
Birat Pandey, PE
Senior Transportation Engineer/Modeler
Baltimore Metropolitan Council
Offices @ McHenry Row
1500 Whetstone Way, Suite 300
Baltimore, MD 21230
Ph: 410-732-0500 x1050
*From:* ctpp-news-bounces(a)chrispy.net [mailto:firstname.lastname@example.org]
*On Behalf Of *Steiss, Todd A.
*Sent:* Monday, February 03, 2014 12:31 PM
*Subject:* Re: [CTPP] (no subject)
I would look at the auto per household ratio or auto per person ratio from
the CTPP 2006-2008 base data and use that to estimate future autos by TAZ.
I think you will be better off using ratios tied to population or
households so that the growth in autos at the TAZ level will keep pace with
the growth in households and/or population. You wouldn't want a TAZ to
have only 10% growth in autos if the household data shows a growth of 50%
for that same TAZ.
*Todd A. Steiss, AICP, GISPSenior Planner*
*121 West Trade Street, Suite 1950*
*Charlotte, NC 28202*
*Direct: 704-342-5411Main: 704-342-5401*
*Mobile: 704-906-7706Fax: 704-342-8472*
*Email: steiss(a)pbworld.com <steiss(a)pbworld.com>*
*On Behalf Of *Sulabh Aryal
*Sent:* Monday, February 03, 2014 11:46 AM
*Subject:* [CTPP] (no subject)
We here in Richmond MPO are developing the Socioeconomic data for our Long
Range Transportation plan. One of the important components of the data is
the total number of automobiles (CTPP Table B111103) by Traffic Analysis
Zones (TAZs). We have in the past used both the CTPP data and the Virginia
DMV registration data to calculate autos by TAZs.
Here are the problems we are facing this time around. The base year for our
socioeconomic data is 2012. CTPP data is a rolling average from 2006-2010.
How would one calculate the estimates for the year 2012 taking CTPP
2006-2008 as the base data? Assuming we do a straight line projection, how
many years do we need to project the CTPP data to get the estimates for the
year 2012? In other words, do we consider the CTPP data from year 2008 (
which is the mid-year) and project the data by 4 years to get the 2012
estimates or do we take the year 2010 ( which is the end year) and project
the data by 2 years to get the 2012 estimates.
Any insight would be appreciated.
Richmond Regional Planning District Commission
9211 Forest Hill Avenue, Suite 200 Richmond, VA 23235
Phone: 804.323.2033 3 Fax: 804.323.2025
saryal(a)richmondregional.org 3 www.richmondregional.org
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