HomeMy WebLinkAboutCT 91-06; Tienda De La Esquina; Tentative Map (CT) (5)April 29, 1991
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TO:JIM MURRAY, ASSOCIATE ENGINEER
FROM: Traffic Engineer
TRAFFIC IMPACT ANALYSIS FOR TffiNDA DE LA ESQUINA (La Costa Retail Center)
I have reviewed the traffic impact analysis report prepared by linscott, Law and Greenspan dated
January 31,1991 for the referenced project and which I received April 9,1991. My comments are
as follows:
The report indicates that the project consists of 50,000 square feet of general office and
retail uses, including an AM/PM Mini-Market. The reduced copy of the site plan in the
report shows gas pumps for the mini-market. The trip generation calculations do not
account for the gas pumps. This should be explained in more detailed as to why it was
excluded. Additionally, the type of proposed restaurant should be explained in more detail
to justify the trip generation rate.
2. Table 1 of the report shows existing traffic volumes. However, 24-Hour ADT volumes
~~ shown are from counts obtained in 1988 and 1989. Current volumes should be provided.
For instance, a count on Camino De Los Coches in September 1990 obtained a 24-hour ADT
volume east of Rancho Santa Fe Road of 2,523 vehicles and not 2,000 as indicated in the
report. A current count will eliminate the need to factor the older count upwards by 3%
per year to approximate existing volumes. Also, each subsequent assumption, figure, etc.
will need to be revised accordingly.
3. ) The SANDAG buildout volume shown in the report, although obtained from the SANDAG
_^s model, obviously is incorrect. That projection is significantly lower than the project only
traffic volumes and is only a very small increase over existing volumes without the proposed
project. Additionally, the report does not reflect the potential development on Camino De
Los Coches across from the proposed project (Calle Timiteo entrance) or the future high
school proposed across from Stagecoach Park. As a result, engineering judgement is
required to realistically estimate the expected traffic volumes on Camino De Los Coches east
of Rancho Santa Fe Road. The estimation should be the basis for the analysis in the report,
signal warrant analysis, impacts on pedestrians, etc. An obvious under projection of traffic
by SANDAG is no reason to promulgate that information into assumptions for a project
traffic impact analysis that will understate traffic volumes.
4. Street segment analysis should be based upon peak hour volumes and not on an ADT basis.
5. Signal warrants should be evaluated with consideration of future volumes correctly
estimated. Caltrans Warrant sheet 9-1C should be used for this purpose. I would agree,
however, that under today's conditions a traffic signal would not be needed.
6. The deceleration lane length on Rancho Santa Fe Road of 315 feet plus a 120 foot
---" transition is acceptable. However, Rancho Santa Fe Road has bicycle lanes and the bicycle
lane must be maintained at the deceleration lane by proper design. Additional right of way
may be required. The deceleration lane width must be a minimum of 12 feet wide.
Jim Murray
Traffic Impact Analysis for Tienda De La Esquina
April 29, 1991 Page: 2
lie report only addresses the intersection of Rancho Santa Fe Road at Camino De Los
Coches, The portion of Rancho Santa Fe Road north of Camino De Los Coches has not
been buHt-to^full prime arterial standards. Additionally, the intersections of La Costa
Avenue/Rancho "Santa Fe Road and Calle Barcelona/Rancho Santa Fe Road should be
evaluated as to impacts- fJRjm this project. Additional intersections on Rancho Santa Fe
Road jmpaeted by 20% or mofe-otthe project traffic should also be analyzed.
ROBERT T. JOHNSON, JR., P.E.
Traffic Engineer
RTJ:rz
City Engineer
Assistant City Engineer
Principal Civil Engineer - LURD