HomeMy WebLinkAboutSDP200900091 Review Comments Final Site Plan and Comps. 2010-02-01Gerald Gatobu
From:
DeNunzio, Joel D., P.E. [ Joel .DeNunzio @VDOT.virginia.gov]
Sent:
Monday, February 01,. 2010 2:11 PM
To:
Gerald Gatobu
Cc:
Amy Pflaum.
Subject:
Arden Place SDP - 2009 -00091
Arden Place SDP - 2009 -00091
Gerald,
I have reviewed the above referenced plan and have the following comments:
1. All proposed construction is off of state maintained roads ROW and VDOT did not review any entrances or roads on
this plan.
2. The signal warrants analysis for the intersection at Rio Road and Putt Putt Place has been re- evaluated by VDOt
Traffic Engineering and the below e-mail is their findings and or recommendations. I recommend that because of the
close thresholds in the study, the developer reevaluate the warrant analysis as needed or at.full build out to see if
conditions change and. a signal is warranted.
3. No changes to the site plan are required by VDOT.
If you have any questions, please let me know.
Thanks
Joel
Joel DeNunzio, P.E.
Staff Engineer
434 - 293 -0011 Ext. 120
Joel. denunzio(cbvdot.virainia.gov
From: Parman, William H. (Bill)
Sent: Thursday, January 21, 2010 8:39 AM
To: DeNunzio, Joel D., P.E.
Cc: Sumpter, Allan D; Shiley, Matthew, PE; Byington, Christopher; Kulkarni, Vidyadhar (Vijay), PE, PTOE; Perry, Richard
Subject: Rio and Putt Putt
Joel,
Per your request I reviewed the consultants warrant analysis for the intersection of Rio Road.and Putt Putt Place in the
Arden Place TIA. (There conclusion was that a traffic signal is not warranted at this time based upon existing traffic,
combined with their projected volume and grown to 2015). As you know Route 631, Rio Road East is functionally
classified as an urban collector but realistically functions as a minor arterial, with a 2007 ADT of 28,000. It is five lane
facility with a two -way left turn lane to the south of this intersection but has a typical left turn lane on the approach from the
west.
My comments are as follows:
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The warrants used for the analysis were 2000 MUTCD; they should have used current standard 2003. The results may
not change but the difference is significant. Although their procedure for analysis was acceptable; all or part of right turn
traffic can be deleted as stipulated in the MUTCD, when all is deleted, the traffic lane is deleted. When this is done then it
is the engineer's judgment and conclusion that if a signal were installed all right turn traffic would have no problem going
right on red. It may also be acceptable to retain all or part of the traffic and keep the side street as two lanes. Conflicting
and prevailing traffic at the varying times of days should be considered in this analysis. Also, the threshold reductions for
speed are as stipulated in the MUTCD, and VDOT follows these guidelines (MUTCD states that warrants can be reduced
to 70 % when mainline speeds exceed 40 mph).
We checked the latest 3 year crash history available, and briefly reviewed the site and sight distances at the intersection.
:There were 3 angle type and one sideswipe collision.in this timeframe, 1/1/2006 to 12/31/09. As the report states the
crash experience warrant was not met, our review confirmed that there was not a correctable pattern that needs to be
addressed. There were no reported pedestrian crashes or injuries in this time-frame at the intersection. Stopping sight
distance. is adequate on both approaches and intersection sight distance, stopped on Putt Putt, is adequate looking east
and marginal looking west down Rio Road. Vertical curvature of the roadway limits line of sight, 'slightly below standard.
My conclusion: there is no overriding "safety" reason to install a traffic signal at this time. I do caution that the projected
2015 side street traffic used for the analysis shows that several hours are very close to the threshold. Also, the left turn
traffic from EB Rio to Putt Putt is substantial in the PM and any increases could also surpass the traffic thresholds
necessary to suggest the need for a traffic signal for this approach. Both of these conditions should be considered and
evaluated in future studies.
William Paiman
Charlottesville & Louisa Area Traffic Engineer
VDOT Northwestern Region Operations
Office 434-951-6298
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