HomeMy WebLinkAboutCSURF RESEARCH CAMPUS - ODP - 4-04B - SUBMITTAL DOCUMENTS - ROUND 2 - TRAFFIC STUDYDELICH ASSOCIATES Traffic & Transportation Engineering
2272 Glen Haven Drive Loveland, Colorado 80538
Phone: (970) 669-2061 Fax: (970) 669-5034
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TO: Armand Trimm, The Neenan Company
Cara Morgan/Roger Sherman, BHA Design
Ward Stanford, Fort Collins Traffic Operations
Ted Shepard, Fort Collins Planning
FROM: Matt Delich
DATE: December 6, 2007
SUBJECT: CSURF/AVA Solar Transportation Impact Study Addendum
(File: 0791ME01)
The TIS for this development indicated that in the short range
future (2012) the Prospect/SB I-25 Ramp intersection would not operate
acceptably in the afternoon peak hour using the background traffic. It
follows that the same intersection would not operate acceptably with the
site (AVA Solar) generated traffic added to the background traffic. It
was demonstrated that acceptable operation could be achieved by adding an
eastbound right -turn lane on Prospect Road approaching the SB I-25 Ramp.
This memorandum addresses the Adequate Public Facilities (APF) issues
regarding this.
In Section 4.5.2 in the "Larimer County Urban Area Street Standards"
(LCUASS), significant negative impacts at a signalized intersection are
defined as: 1) when the added traffic causes an intersection to fail the
minimum acceptable level of service (LOS) standard; or 2) when the
background traffic conditions causes an intersection to fail the minimum
acceptable LOS standards and when the project traffic causes more then a
2 percent increase in the intersection delay. In this case, the second
portion of the section of the guidelines applies.
Using the short range (2010) background afternoon peak hour traffic,
the calculated intersection delay is 622.5 seconds with the existing
geometry. The intersection operates at LOS F. In the afternoon peak
hour, the traffic assignment showed an increase of 40 vehicles at this
intersection. Using the short range (2012) total afternoon peak hour
traffic, the calculated intersection delay is 629.4 seconds with the
existing geometry. The intersection operates at LOS F. The difference
in delay is 6.9 seconds. Dividing 6.9 seconds by 622.5 seconds results
in an increase in delay of 1.1 percent. Since the project impact at this
intersection is less than 2 percent, it is concluded that this project
does not cause a significant negative impact at the Prospect/SB I-25 Ramp
intersection. Therefore, the Fort Collins APF criterion is met.