HomeMy WebLinkAboutS4- Public Works CITY OF SAN BERN'IDINO - REQUEST Fr`R COUNCIL ACTION
File No. 6.44
Authorization to Issue Request
From: ROGER G. HARDGRAVE Subject: for Proposals & Purchase Order
for Micro Computer
Dept: Public Works
Date: 2-5-93 Traffic Forecasting Model
Synopsis of Previous Council action:
June, 1992 -- Allocation of $150 , 000 approved in 1992/93 Budget
for the 1/2� Sales Tax Fund.
Recommended motion:
1 . That the Director of Public Works/City Engineer be authorized
to issue Request for Proposals in connection with establishment
of a City-wide Traffic Forecasting Model pursuant to the Conges-
tion Management Program.
cc : Shauna Clark
Tim Steinhaus
Barbara Dillon
Signature
Contact person: Roger G. Hardgrave Phone: 5025
Supporting data attached: Staff Report Ward: All
FUNDING REQUIREMENTS: Amount: $150 , 000 (1/2� Sales Tax-Local Funds)
Source: (Acct No.) 129-309-57734
Acct. Description) Congestion Management Model
Finance:
Council Notes:
7-
75-0262
Agenda Item No. °�
CITY OF SAN BERN/ IDINO - REQUEST FCA COUNCIL ACTION
STAFF REPORT Page 1 of 3
Both Caltrans and SCAG have conducted travel demand
forecasting activities in the Southern California area since the
early 1970 ' s . In 1984 , an effort was launched to model traffic
demand in Riverside and San Bernardino Counties (RIVSAN) . SANBAG
is currently striving to complete a model for the Congestion
Management Plan, based upon the most recent version of RIVSAN.
While the regional and sub-regional models have their
purposes , they cannot be detailed enough to meet the objectives
of city land use elements or specific street improvement
projects .
Section 8 .F "TRANSPORTATION MODELING FOR THE CMP, " of the
Congestion Management Plan, lists the following four functions
that a traffic model for a local agency can provide:
• Annual forecasting of or on the CMP network for facil-
ity programming purposes .
• Forecasting in conjunction with Traffic Impact Analysis
(TIA) reports .
• Forecasting for specific corridor and subarea studies
( "congestion management master plans" ) .
• Forecasting in association with the preparation of
deficiency plans.
Transportation modeling is a mathematical simulation of
vehicle travel at a future date on existing or proposed street
networks. It takes into consideration the socio-economic data
input, such as population, housing, employment, retail , to fore-
cast travel based on the principle of attraction between traffic
generators and attractoos .
Simply stated, the model divides the City into several
hundred zones , and simulates the travel interaction not only
between these zones , but also outside the City limits (inter-
regional travel) . All travel is assigned to street network based
on several factors , such as: travel time, street capacities ,
mode of travel , etc. Once the model is established, it requires
constant update/maintenance effort (land use changes , development
growth, traffic volume monitoring/updates) .
The most common output derived from a transportation
modeling process includes daily and peak volumes , intersection
turning movement volumes, regional travel statistics, such as
vehicle miles traveled (VMT) , and input data for air quality
analysis models.
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Some useful application of model output includes trans-
portation systems alternative analysis, land use alternative
analysis - jobs/housing balance, general plan updates , developing
an equitable traffic system fee and the development of trans-
portation control measures (TCM) .
A City traffic forecasting model will allow the impacts of
a proposed development to be assessed. Also, the model can be
used in updating the Circulation Element in the General Plan, and
provide data for traffic studies in Redevelopment Project Areas.
The Intermodal Surface Transportation Efficiency Act
(ISTEA) includes a requirement that projections of future traffic
be provided in support of a project financed with funds allocated
under this act.
A traffic model can be operated by a consultant or City
staff. In order to achieve consistency and quality control , we
recommend that the model be set up, by a consultant and operated
by -City staff. The consultant will load the program and train
City staff on the operation of the model . We anticipate the
consultant' s fee will be about $140 , 000 .
Operation of a traffic forecasting model is a meticulous
and time consuming process . Our best estimate of this time is
that one full-time personnel will be needed. At least two
additional personnel will be trained in the operation of the
model to provide back-up and consistency. It is anticipated that
an additional position of Civil Engineering Assistant III be
needed to operate the model .
It is expected that a high speed micro computer, with a
large storage capacity and plotter, will be required to run the
model. The cost of this equipment is estimated at $10 , 000 .
An amount of $150 , 000 has been allocated, under Account
No. 129-309-57734 , for the model. This amount will cover the
estimated cost for the consultant and acquisition cost of the
necessary hardware.
The annual cost for a Civil Engineering Assistant III, at
Step 1 , including variable benefits that rise with salary, is
estimated to be $50 , 622 . It is proposed that the salary costs
for this additional position be provided as follows:
Economic Development Agency (1/2) - $23 , 628
Reimbursement of Costs by Consultants 10 , 000
Traffic Systems Fee Fund 13 , 628
Total Cost - Salary & Variable - $47 , 256
Benefits
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STAFF REPORT
Page 3 of 3
Consultants will need traffic forecasting data in order to
prepare traffic studies (or Traffic Impact Analysis) , for new
developments . They will be able to produce this data on their
own, or reimburse the Cite for the costs incurred in producing
the data that they need for their studies .
Most other cities within the surrounding area are in the
process of acquiring traffic models . Any city without a model
could be at a distinct disadvantage in a conflict resolution
process with another local agency.
The consultant services will be done in two phases , with
the first being a needs assessment. Under this phase, the
consultant will review the data available from our General Plan
update , and GIS on the City' s main frame computer. The
consultant will then make a recommendation on how available
information can be used in developing the traffic model , the
necessary hardware and personnel to operate the model . After the
recommendations under Phase I have been approved, a Request for
Proposals will be prepared and issued to qualified consultants .
In conclusion, the City is not specifically required to
have a traffic forecasting model . However, there appear to be
some significant advantages to the City in having a model.
Therefore, we recommend that authorization be granted to issue
Requests for Proposals and a Purchase Order, and that the
establishment of the additional position be approved.
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