HomeMy WebLinkAbout1983-06-21; City Council; 7413; Award of Contract Traffic Computer ModelCIT1 3F CARLSBAD - AGENDi 31LL
g_�Y�3 jITLE: DEPT. HD.
A
6/21/83 A14ARO OF CONTRACT CITY ATTY
MTc3. TRAFFIC COMPUTER 140DEL
-6 CITY MCiR
DEFT.—U.
RECOMMENDED ACTION:
Adopt Resolution Ho-SZ2 G approving an agreement with SANDAG for joint
development of a Traffic Computer Model; authorize the .11ayor to sign the
agreement on behalf of the City and authorize the Finance Director to
encumber funds in the amount of $14,890 for the completion of the Traffic
Computer 1-todel, acquisition and adaption of the IMPAX program and related
staff training.
ITEM EXPLANATION:
In August 1982, Willdan Associates completed a Study of Circulation Problems
and -prepared a report. In their report, they emphasized that their traffic
projections were "rough estimates" and they strongly recommended that a
computer model be performed. They further recommended that the model await
SANDAG Series VI forecasts which are now available.
On 1-lay 4, 1983, the Circulation Plan Advisory Committee unanimously endorsed
the preparation of a computer model, and further recommended sufficient
staffing so that the computer model may be used in future years.
SANDAG has prepared a scope of work for the project and Drepared an agreement.
Approximately 400 hours of City staff time will be required to gather data
for the model and review the output. Repre:;entatives of the Engineering
Department, the Research and Analysis Group and the Land Use Planning Office
have met and determined that they will be able to provide the staff input
with each one providing about one-third of the effort.
It will take approximately three months to complete the computer model.
Once the model is complete, there will be a need to update it periodically
and to determine intersection capacities. These activities are not covered
within the SANDAG proposal. They can, however, be accomplished with a program
known as IMPAX which can be adapted to Engineering's HP125 computer for
"in-house" modeling. Staff recommends the inclusion of this program and the
related staff training as a supplement and enhancement to the Traffic Computer
kModel.
FISCAL EMPACT:
o The total cost of the SANDAG traffic model is $13,335. SANDAG will contribute
one-third of this amount through a Local Technical Assistance program making
a- the City's cost $8,890. In addition, staff estimates they will spend $7000
for labor cost in direct support of the program.
CThe total cost the I1APAX program is estimated at is $6000. Of this amount
h $4000 will be spent on acquisition and adaption to the Engineering Department
v HP125 computer. The remaining $2000 will be spent on staff training and software
maintenance.
J
v The non -labor cost of the whole program is $14,890. Funds in the amount of
$24,561.40 are available in the Research and Analysis Group professional
vservices account No. 01-32-40-2470, for use on this project.
EXHIBITS:
1. '1lhat is a Traffic Computer Model?"
2. Resolution tlo.22�L(,.approving agreement with SA11DAG & encumbering funds.
3. Letter from SANDAG dated 3/17/83 with attachments (Agreement)
WHAT IS A TRAFFIC COMPUTER MvDEL?
What is a traffic computer model?
it is a representation --in mathematical form --of all the
arterial streets in Carlsbad. The model will project all
future average daily traffic (ADT) volumes on each link of
the system.
Didn't Willdan do that in their Circulation Study?
No. According to their own report, Willdan made "rough
estimates" of traffic volumes on each street. They did not
logically distribute it as explained below.
Flow does the computer model work?
The model attempts to simulate the logic people use when
they drive. Quite simply, you drive via a route that will
get you to where you are going in
the shortest
time. The
placed
length of each street, its typedesign speed
p into zones
into the computer. The City is then broken up
and the traffic from each zone estimated. The computer then
distributes trips according to which is the fastest route.
Why is it needed?
First, and most important, the ultimate traffic volumes for
the City a•c buildout must be known so that the streets for
the Circulation Element of the General Plan can be determined.
Also, the model will analyze a number of alternative possibil-
ities and their effect on the circulation system. For example,
whether Highway 680 is built or not built may determine whether
Melrose Avenue should be a prime or a major arterial.
How do we know if the model is accurate?
A computer model of the exis-Lng arterial system with the
existing land uses will be run. The computed volumes will
then be compared with those actually measured. If they are
the same, the model is valid, if they are not, the model will
be adjusted.
Can the model be updated in the future?
Yes, however, currently this would require requesting the
information from SANDAG which may be costly and definitely
would be time-consuming.
An in-house computer program would
"what -if" studies of development o
and would make the model a "living"
outdated.
prepared by:
RICHARD ALLEN
Engineering Department
6/14/83
enable staff to make rapid
r land use change proposals
tool that would not become
EXHIBIT 1
Stui Dicgo
ASSOCLUION OF
GOVERNMENTS
Suite 524 Security Pacific Plaza
1200 Third Avenue
San Diego, California 92101
1619) 236-5300
Mr. Richard Allen
Principal Civil Engineer
City of Carlsbad
12,00 Elm Avenue
Carlsbad, CA 92008
Dear Richard:
�RECEIi V ED983
MAR 2 11983
CITY of CARLSBAD
ENGINEERING DEPARTMENT
Attached is a detailed scope of work and a cost estimate for a Carlsbad subarea
study that has been prepared by our agency in association with Bob Sergeant of
Willdan Associates. 'tlle staff time estimates shown for Carlsbad are approxima-
tions and are included in order to provide an estimate of the division of
responsibilities between SANDAG and Carlsbad. It is our understanding that
Willdan Associates will be providing most, if not all, of the Carlsbad "staff"
commitment to this project and that this commitment is a contractual matter
between Carlsbad and Willdan.
SANDAG's total estimated cost for the attached scope of services is $13,335. It is
proposed that the City of Carlsbad commit to an amount not to exceed $8,890, or
two-thirds, of the SANDAG cost of the study as proposed in the attached work
scope. A two-thirds/one-third cost sharing Is currently being used in the
subreglonal study of the Poway area and is generally reflective of the mutual
benefit of the project to the affected SANDAG member agencies, in terms of
their local circulation element needs, and to SANDAG Is terms of our regional
highway planning responsibilities.
Attached are two copies of a simple one -page "agreement" executed by us for this
project. If the proposed scope of work, basis for cost sharing, and "agreement"
are satisfactory to you, please return one copy of the executed "agreement" to us.
Based on our recent phone conversation, you indicated that Carlsbad was inter-
ested in the possibility in acquiring a microcomputer for use In transportation
analysis work. As Is readily apparent from the attached work scope, a major
portion of the subarea study effort Is related to the preparation of the networks
and date: files. Should you decide to acquire a microcomputer system with trans-
portation analysis capabilities we would be happy to work with you to Help ensure
the transferability of the subarea study data files to whatever system you acquire.
'This should enable you to have a working subarea model system "in-house" at the
earliest possible date that you can use to test the impacts of transportation and
land use changes. A second approach to using the subarea model system as a
working tool for testing system changes would involve accessing the subarea
model on our minicomputer from Carlsbad via remote terminal. We have the
funding necessary to develop a quick response interactive system that should allow
EXHIBIT 3
MEMBER AGENCIES Crises of Carisbac: Chula Vista. Coronado, Del Mar, El Calon, Escondido, Imperial Beach, La Mesa Lemon Grove, National City, Ocean"de,
Poway, San Die9o,SanMarcos, Santee acdVista ADVISOF.Y(LIAISONMEMBERS.Cauf.Dept.olTransportationiU.S.Dept of Defense andTpuana/Baja Calif Norte
City of Carlsbad
March 17, 1983
Page 2
YOU, for example, to test the impact of minor land use changes via remote
terminal with telephone within a two-hour time
Interested in exploring these or other period.
er possible alternatives, please let me knare
ow.
We look forward to working the Carlsbad on this project, and should you have any
questions or concerns, please don't hesitate to contact me at 236-5363.
Sincerely,
D„�
LEE F. IIUVrGU-N
Director of Transportation
LFH/ajh
Attachment
cc: Bob Sergeant, Willdan Associates
q
—,
CITY OF CARLSBAD
SAN DIEGO ASSOCIATION OF GOVERNMENTS
LOCAL TECIINICAL ASSISTANCE AGRELMENT FOR
SUBAREA TRANSPORTATION STUDY
WHEREAS, the City of Carlsbad ("City") requires the conduct of a
subarea transportation study for the Carlsbad area; and
WHEREAS, the San Diego Association of Governments ("SANDAG"),
under its Local Technical Assistanc-, Program, has agreed to supply such services.
The parties hereunto agree as follows as of this 22nd day of June ,
1983.
1. SANDAG shall supply the services shown in Attachment A to this Agreement,
which -is hereby mworporated into this Agreement as if fully set forth herein.
2. City agrees to provide or cause to be provided the necessary input, review
and assistance to SANDAG, as shown in Attachment A.
3. City agrees to pay SANDAG two-thirds (2/3) of its costs to carry out this
Agreement, in an amount not to exceed $8,890, upon, completion of the work
identified in Attachment A.
�;rrY OF CARLSBAD
By:
WARY H. CA=. , Mayor
SAN DIMO ASSOCIATION OF GOVERNMENTS
By: �RlCIIARD J. 1, Execufiive Director
ATTACHMENT A
i
CITY OF CARLSBAD SUBAREA TRANSPORTATION STUDY
PROJECT TASI{S AND COST ESTIMATES
SANDAG CARLSBAD
Technician Planner Computer Technician Planner +
Hours Hours Cost Hours Hours +
BASE YEAR ANALYSIS
i
L Develop and code base
highway network
A. SANDAG provides map 6 2
showing roads on regional
highways network in Carls-
bad area and a listing of
roadway data for those roads
from SANDAG files. 4
B. Carlsbad reviews SANDAG . - - - 12 36
highway network for accuracy i
and odds base year roads of
local interest. Carlsbad pro- ,
vides roadway data for added
roads.
C. SANDAG assists Carlsbad with - `l
network definition and re-
views final network.
D. SANDAG assigns node 60 16 $10
i
numbers and codes net-
work data.
E. SANDAG runs program to - 2 $10 8 4
compute speeds and capa-
cities, format data in
TRANPLAN format and
generate network descrip-
tive reports. 'Carl,uad reviews
network reports for accuracy.
F. SANDAG corrects any - 2 $40 -
errors and runs TRANPLAN's
"highway networks build" and f
"highway selected summation',
r
programs. }
II. Develop subzones
A. SANDAG provides map of A -
Carlsbad area showing
regional, zone boundaries.
B. Carlsbad develops sub- -
8 24 32
zones delineating existing
and future neighborhoods,
commercial areas and indus-
trial areas with SANDAG's
assistance.
C. SANDAG digitizes subzones 24
8 $100 - 4
and produces plot. Carlsbad
reviews plot for accuracy.
III. Generate base year land use
data.
A. SANDAG overlays zones on 1G
4 $200 - `
1980 Regional Land Use
file and produces reports.
B. Carlsbad reviews SANDAG -
- - 24 24
land uses for accuracy
and splits regional land
use categories into finer
categories if desired.
C. SANDAG updates land ase 4
file as necessary.
1V. Generate base year trips.
A. Carlsbad reviews SANDAG -
- 2
trip genration rates
for accuracy.
B. SANDAG runs trip `
1/2 $5 -
generation program.
V. Distribute trips.
,
A. SANDAG updates travel -
112. $15 -
time matrices with
intrazonal times.
B. SANDAG replaces regional -
1/2 $50
productions and attrac-
tions in Carlsbad area with
subzone productions and
attractions and runs auto
driver trip distribution.
F .
t
i
0
C. SANDAG factors daily pro-
- 1/2 $150 -
i
duction attraction trip
tables from gravity model
to obtain peak period and
ofPpeak period origin -
destination trip tables.
i
Vl. Assign Base Year Traffic.
4
A. SANDAG runs peak and off-
- 1/2 $200
peak capacity restraint
assignment.
B. SANDAG generates reports
- 4 $10
summarizing assignment
results and colpr raring,,
volumes with ground counts.
VU. Calibrate Base Year Assignment.
A. SANDAG and Carlsbad review
- 16 8
results of base year assign-
ment. SANDAG adjusts net-
work and/or trip generation
}
rates as necessary to bring
assignment into agreement with
ground counts.
B. Repeat base year model run
- ' 4 $475
with adjustments to obtain
final base year assignment.
FUTUJ1r_ YEAR ANALYSIS
1. Develop and Code Future Year
Highway Network
A. Carlsbad with SANDAG assis-
- 4 - 8 32
` tance prepares a map show-
ing roadway changes for
g
future year alternatives
to be tested and provides
assumptions about changes
in, roadway data.
k
B. SANDAG codes future year
24 8 $10 -
networks.
L
i
I
C. SANDAG runs program to
2 ' $10 4
compute speeds and capa-
cities format data in TRAN-
`PLAN format, and generate
i descriptive reports. Carlsbad
i reviews network reports for
accuracy.
2 $40
D. SANDAG corrects any errors - #
and runs TRANPLAN's "highway
network build" and "highway
selected summation" programs
• 1
IL Generate Future Year Land Use. j
A. Carlsbad with SANDAG assis-
4 _ 48 48
tance provides future land
use by subzones for develop-
ment plan being analyzed.
B. SANDAG updates base year 16 - r
land use file.
IU, Run Transportation Models
for Future Year.
A. SANDAG runs trip gen- - 3 $420 `
eration, trip distribution,
peak period and traffic
assignment programs.
B. SANDAG generates reports - 4 $10 `
shoving future year traffic
volumes, congestion levels,
etc., for daily and peak/
off-peak period conditions.
C. SANDAG and Carlsbad review -
16 - - 24
' future year forecasts.
TOTAL COSTS
1. Base Year Analysis 114 73 $1,265 68 108
SANDAL costs = 114 hrs. @ $15/hr.
+ 73 hrs. @ $35/hr. + $1,265 = $5,530.
2. Future Year Alternative 40 43 $490 48 92
With land use alternative)
SANDAL Costs = 40 hrs. @ $15/hr.
+ 43 hrs. @ $35/hr. + $490 = $2,595
3. Future Year Alternative 12 23 $480 4 32
(No land use change, major
highway network change)
SANDAG Costs = 12 hrs. @ $15/hr.
+ 23 hrs. @ $35/hr. + $480 = $1,465
4. Future Year Alternative 4 8 . $220 - 12
Minor Roadway Changes)
SANDAG Costs = 4 hrs. @ $15/hr.
+ 8 hrs. @ $35/hr. + $220 = $560.
Based on discussions with Bob Sergeant, the Carlsbad subarea traffic study will require the
following analyses: one base yea, calibration costing $5,530; two future year land use alternatives
costing $5,190; one additional highway system alternative costing $1,465; and two minor roadway
alternatives costing $1,120. Total SANDAG costs are $13,335. After subtracting SANDAG's one-
third. Local Technical Assistance contribution, the cost to the City of Carlsbad for the entire
project is $8,890.
v
RESOLUTION NO. 7256
1
A RESOLUTION OF THE CITY COUNCIL OF THE CIT
THE CITY 2 CALIFORNIA, APPROVING AN AGREEP9ENT BETwOFNGOVERNMENTSFT0
CARLSBAD AND THE SAN DIEGO ASSOCIATION
3 PREPARE A COMPUTER MODEL OF TRAFFIC CIRCULATION IN THE ,
d CITY OF CARLSBAD.
5
The City Council of the City of Carlsbad, California, does hereby
6 resolve as follows:
That certain agreement between the City of Carlsbad and the San
7 1• 1
8 Diego Association of Governments (SANDAG) for a computer model of traffic
Of Carlsbad which is on file in the City Clerk's
9 circulation in the City .
3.0 office, is hereby approved.
and
11 2. The Mayor of the City of Carlsbad is hereby authoCit dof Carlsbad.
12 directed to execute said agreement for and on behalf oencumberfundsin the
hy'
13 3. The Finance Director is authorized t
14 amount of $14,89,0 in account number 01-32-40-2470 for this project' Council
15 PASSED, APPROVED AND ADOPTED at a regular meeting of the City
1983,
16 of the City of Carlsbad held the 21st day of June
i
17 by the following vote, to wit:
18 AYES: Council Members Caslerr Lewis, Kulchin, Chick and Prescott
19 NOES: None
i
20 ABSENT: gone ��� •
3
21 - .I R '}l"LER, Mayor
22 ATTEST,
23• � � t
2� Clerk
ALETHA L. RAUTENKRAN., City
25
26 (SEAL)
27