TRAFFIC STUDY REV 8/27/1997
LAWRENCE AND HYPOLUXO
COMMERCIAL CENTER
TRAFFIC STUDY
PALM BEACH COUNTY, FLORIDA
Kenneth J. Cox, P.E.
Florida Registration No. 46572
Robert Campbell, P.E.
Florida Registration No. 26732
Carnahan-Proctor & Associates, Inc.
6191 West Atlantic Boulevard
Margate, Florida 33063
(305) 972-3959
FAX (305) 972-4178
August 29, 1995
Rev. August 27, 1997
(Note: August, 1997 Revision Limited to Responding to City Comment about
Driveway Volume)
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TABLE OF CONTENTS
INTRODUCTION
STUDY OBJECTIVE
TRANSPORTATION ANALYSIS
Project Trip Generation
Study Area
Existing Conditions
Future Roadway Improvements
Development Access
Background Traffic
Project Traffic Distribution & Assignment
Future Traffic
Level of Service Analysis
Test I . Link/Buildout Test
Alternative Test I
Test 2 . Model test
CONCLUSIONS & RECOMMENDATIONS
Page
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3
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5
5
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10
10
14
14
14, 15 & 16
16&17
17
INTRODUCTION
DeSanti & Associates retained Carnahan-Proctor & Associates, Inc. to evaluate the traffic impact
associated with the proposed Lawrence and Hypoluxo Commercial Center.
The Development Site is about 8.3 acres and located in the southeast quadrant of the Lawrence
Road and Hypoluxo Road intersection. Figure 1 depicts the general location of the site. This
was the former location of the Living Color Nursery Retail and wholesale garden center until
December of 1989. The proposed site modifications consist of the followings type and gross
floor area of building space:
. 18,500 Square Feet (S.F.) of general retail
. 3,800 S.P. of bank with drive-through
. 7,200 S.F. of fast food restaurant with drive-through
Site access will be by driveway connections with Lawrence and Hypoluxo Road.
STUDY OBJECTIVE
This traffic impact study has been prepared following Section 7.9 (Traffic Performance
Standards) which amends the previously adopted 1990 Countywide Traffic Performance
Standards Code (Ordinance 90-40).
These Standards require development to meet two "tests". Test 1, Link Buildout Test, requires
that total traffic on any roadway link within the project's radius of Development Influence that
would result in an average annual daily traffic volume that is less than the adopted threshold
level of service during the buildout period of the project.
Test 2, Model Test, requires that total traffic on any link within the project's Model Radius of
Development Influence would result in an average annual daily traffic volume that is less than
the adopted threshold level of service, as determined by the FSUTMS model.
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TRANSPORTATION ANALYSIS
Project Trip Generation
The traffic to be generated by the proposed development is based on the trip generation rates
presented in Table 10.8-1 of Article 10 in Palm Beach County Land Development Codes for
daily trips and I.T.E. Trip Generation, 5th Edition for peak periods.
General Commercial Retail (18,500 S.F.)
Total Daily Trips = Ln(T) = 0.625 Ln (X) + 5.985
Total Daily Trips = 2460 tpd
Less 44.70% Pass-By Trips = (1100) tpd
Net Daily Trips = 1360 tpd
Bank with Drive Through (3,800 S.F.)
Total Daily Trips = 3,800 S.F. * 265.21 K.S.F. = 1008 tpd
Less 46% Pass-By Trips = (464) tpd
Net Daily Trips = 544 tpd
Fast Food Restaurant with Drive Through
Total Daily Trips = 7.200 S.F. * 632.12 K.S.F. = 4,551 tpd
Less 30% Pass-By Trips = 1,365 tpd
Net Daily Trips = 3,186 tpd
Subtotal = 1360+544 + 3,186 = 5090 trip ends
Internal Site Trip Ends
5% Internalization = 255
Total Vehicles Entering and Leaving Development = 4835 tpd
Study Area
The study area is based on the radius of development influence for Test I & Test 2, which is
outlined in Table 2A and Table 2B of the Traffic Performance Standards. Table 2A and Table
2B relate the maximum radius of development influence distance to the net trips generated by the
site. For a net trip generation of 4,788 trips per day the radius of development influence is 2 mile
for Test I and Test 2. Figure 2 displays the 2 mile radius of development influence.
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Existing Conditions
Existing traffic counts were obtained from the Palm Beach County Metropolitan Planning
Organization for 1994-95. Figure 3 shows the available traffic counts for the roads within study
area.
The existing number of lanes for the roads was also obtained from the Palm Beach County
Metropolitan planning Organization and is presented in Figure 4.
Future Roadway Improvements
Palm Beach County "Five Year Road Program" and Florida Department of Transportation
''Transportation Improvement Program" were the sources for the funded roadway improvements
expected to be completed by the developments build out year. Gateway Boulevard is funded for a
future improvement from 2 lanes to 6 lanes divided. This study will depend on this improvement.
Development Access
Development access will be driveways connecting to Hypoluxo Road and Lawrence Road.
Hypoluxo Road at Lawrence Road location is a four lane divided arterial with exclusive left-turn
and exclusive right-turn lanes. Lawrence Road northbound direction, south approach, consists of
a single left-turn lane and a through and shared right-turn lane. The southbound direction, north
approach, consists of one through lane and exclusive left and right-turn lane.
Background Traffic
An analysis of background traffic growth was conducted for the radius of development influence
using the latest available growth rates provided by Palm Beach County. The compound growth
rates are estimated using the increase/decrease of average daily traffic over the most recent three-
year period. Palm Beach County requires engineering judgment be exercised in applying historical
growth rates. Table 1 summarizes the growth rate analysis.
In addition to the compound growth rates, the study consider all major projects that could have an
impact on the roadway network within the study area. Palm Beach County "Major Projects Map"
was the source for the location of these projects. No major projects were identified within the
study area.
Figure 5 is a roadway network map annotated with the total background traffic within the study
area.
5
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TABLE 1
ANALYSIS OF AVERAGE TRAFFIC GROWTH RATE
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Lawrence Rd. Hypoluxo Rd. Gateway Blvd. 7,751 7,382 7,646 7,866 0.49%
Lawrence Rd. Gateway Blvd. Old Boynton Rd. 10.721 10,559 10,652 10,911 0.59%
Military Trail Melaleuca Ln. Lantana Rd. 24,930 31,9n 31,639 30,968 7.50%
Military Trail Lantana Rd. Hypoluxo Rd. 20,599 24,143 24,849 25,632 7.56%
Military Trail Hypoluxo Rd. Gateway Blvd. 20,237 25.138 23.873 23,072 4.47%
Congress Ave. Lantana Rd. Hypoluxo Rd. 27,132 23,719 23,439 23,854 -4.20%
Congress Ave. Hypoluxo Rd. Miner Rd. 30,390 28,972 25,540 28,327 -2.32%
Lantana Rd. Jog Rd. Military Trail 18,106 22,924 21.064 23,140 8.52%
Lantana Rd. Military Trail Congress Ave. 24,960 27.382 28,259 28,169 4.11%
Hypoluxo Rd. Jog Rd. Military Trail 7,688 10,810 10,556 12,693 18.19%
Hypoluxo Rd. Military Trail Lawrence Rd. 18,204 23,179 21,716 22,696 7.63%
Hypoluxo Rd. Lawrence Rd. Congress Ave. 24,898 27,381 23,995 26,947/ 2.67%
Hypoluxo Rd. Congress Ave. 1-95 30,6n 31,720 27,973 30,439 -0.26%
Gateway Blvd. Military Trail Lawrence Road 8,391 10,706 14,130 14,219 19.22%
Gateway Blvd. Lawrence Road Congress Avenue 14.944 17,528 19,783 21,190 12.34%
Areawide --- - 297,391 331,737 321,910 337,127 4.27%
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Project Traffic Distribution and Assignment
Distribution of project trips came from proportioning trips by using the Palm Beach County
Metropolitan Planning Organization's socioeconomic data and knowledge of the area. The
socioeconomic data are available through the "ZDATAl files" of the Urban Area's Transportation
Models for all zones within the study area. The generation files include all single and multi family
development within the study area. Residential land use was the basis for distribution of trips.
Non-home based trips were considered significant for this area. The following distribution was
obtained:
TRIPS DISTRffiUTION
DIRECTION
North
South
East
West
PERCENTAGE
27%
33%
24%
16%
The distribution rates came from the premise that the percent of site traffic produced is directly
proportional to the attraction size and inversely proportional to the square of the distance from
the site to the attraction.
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The assignment of site traffic was performe~he minimum travel time that drivers would
more frequently favor in their route solution~'f7~gure [;.eports the assigned project to the area's
roadways.
Four access driveways are proposed. Three will be limited to right entry and exit: one
intersection with Lawrence Road and two intersections with Hypoluxo Road. The fourth
driveway will be the eastern most entry and exit access point and will have full access. That is,
the intersection will have an eastbound right turn lane and a westbound median left turn lane and
the exiting vehicles may turn left to go west on Hypoluxo Road.
The traffic volume using the driveways by direction are related to the trip distribution are related
to the trip distribution and site circulation. Twenty percent (20%) of the development entering
traffic will likely use the westbound left turn lane for entry, that is 80 vph during the AM peak
hour and 70 vph during the afternoon peak hour. During the PM peak hour the median opening
would serve 110 vph development generated eastbound-to-westbound "U-turn" and 48 vph
outbound "Left-Turns."
Future TraffIC
Figure 7 confirms the total 1996 traffic volume for the commercial development. The total traffic
volumes are the summation of the assigned project traffic, the projected 1996 background traffic
growth, and the existing 1994-1995 traffic volume.
The future traffic volume served as the basis for determining level of service compliance.
10
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Level of Service Analysis
This traffic analysis must demonstrate compliance with the standards contained in Section 7.9 of
the Palm Beach Traffic Performance Standards. The Standards consist of complying with the
adopted level of service for Test 1 or Alternative Test 1 and Test 2. The following details the
analyses for each tests.
Test 1 - Link/Buildout Test
The analysis consists of projecting the project's new trips on the major thoroughfare links within
the project's radius of development influence and evaluating the level of service for the total
traffic. The total traffic consists of project traffic, existing traffic, background traffic and
committed traffic. The standards state that the level of service may be exceeded by a total of 5%
of level of service D provided that no one project may use more that 1/5 of the 5% or 1 % of the
total available on any link within the project's radius of development influence.
From Table 2A of the Palm Beach County Land Development code, the maximum radius of
development influence is 2 miles for a net trip generation rate of 4788 trips/day. Therefore all
roadway links within the 2 miles distance must meet Test 1. Meeting Test I consists of relating
the projected total traffic to the level of service D's average daily traffic. This could be
accomplished by evaluating the projected total traffic, as shown in Figure 7, and the average daily
traffic for the level of service D as tabulated in Table lA of the Palm Beach Traffic Performance
Standards.
The following segments within the radius of development of influence exceed the allowable level
of service for Test 1:
. Lantana Road from Military Trail to Congress Avenue
. Hypoluxo Road from Lawrence Road to Congress Avenue
. Congress Avenue from Hypoluxo Road to Miner Road
However, the project traffic for Congress Avenue, 209 vehicles per day, from Hypoluxo Road to
Miner Road does not exceed the allowable 1/5 of 5% tolerance which is 294 vehicles per day. In
addition, Congress Avenue is not a directly access link to the site.
The other two segments, Lantana Road from Military Trail to Congress Avenue and Hypoluxo
Road from Lawrence Road to Congress Avenue fail Test 1 and the project traffic is more than the
allowable 1/5 of 5% rule. Alternate Test I was analyzed for these segments to determine if
improvements are needed due to the project traffic.
Alternate Test 1
Alternate Test I was conducted for the segment of Lantana Road from Military Trail to Congress
A venue, and Hypoluxo Road from Lawrence Road to Congress A venue.
14
Alternate Test I can be satisfied if peak hour, peak season, peak direction volume does not
exceed the allowable level of service listed for the peak hour directional volumes for urbanized
areas in Table 3-1 of the FDOT Level of Service Manual, and the intersection's critical volumes
do not exceed 1400 vehicles as outlined in the Highway Capacity Manual, planning analysis
method.
The peak hour, peak season, peak direction volumes for the failed links were analyzed for
existing and future conditions. The peak season traffic counts for Lantana Road east of Military
Trail and Hypoluxo Road from Lawrence Road to Congress Avenue are included in Appendix A.
The peak to daily ratio and directional factors for the morning and evening peak hours were
applied to the latest average daily traffic count information from the Metropolitan Planning
Organization. The re:mlts of the analysis are as follows:
LINK ANALYSIS
Lantana Road, East of Military Trail
Condition Direction Peak Hour Peak Volume
Existing Eastbound AM 1512
Existing Westbound PM 1583
Future Eastbound AM 1643
Future Westbound PM 1721
Hypoluxo Road, East of Lawrence Road
Condition
Direction
Peak Hour
Peak Volume
Existing
Existing
Future
Future
Eastbound
Westbound
Eastbound
Westbound
AM
PM
AM
PM
1488
1334
1618
1450
The maximum peak hour, peak season, peak directional volume does not exceed the 2210 vph
threshold. Therefore, the link capacity requirements for Lantana Road and Hypoluxo Road are
satisfied.
Turning movement counts were obtained for the intersection of Lantana RoadIMilitary Trail and
Lantana Road/Congress Avenue. Turning movements were also obtained for Hypoluxo Road at
Lawrence Road and Hypoluxo Road at Congress Avenue. Intersection planning capacity
15
analyses were conducted for existing peak hour turning movement counts and projected future
turning movement volume with project traffic utilizing the computer program Signalized
Intersection Planning Analysis (SIPA). Appendix B contains the collected turning movement
counts, and Appendix C contains the SIP A output for the two intersections.
These intersections will operate with the following critical volumes:
INTERSECTION ANALYSIS
Locations Condition Peak Hour Sum Critical Volumes
Lantana/Congress Existing AM 1017
Existing PM 1564
Future AM 1078
Future PM 1356
LantanaIMilitary Existing AM 1068
Existing PM 940
Future AM 1130
Future PM 996
HypoluxolLawrence Existing AM 945
Existing PM 964
Future AM 1054
Future PM 1076
Hypoluxo/Congress Existing AM 1041
Existing PM 1276
Future AM 1118
Future PM 1382
From the above tabulation, the subject intersections do not exceed the maximum allowable 1400
sum of critical volume.
The Lantana Road segment from Congress Avenue to Military Trail and Hypoluxo Road from
Lawrence Road to Congress A venue will meet Alternate Test 1 for future conditions.
Test 2 - Model Test
The analysis consists of obtaining the project's net trips as projected in the trip generation
section and utilizing the net trips to obtain the model radius of development influence through
Table 2B of the Palm Beach County Traffic Performance Standards. The total traffic differs
from Test 1 and is defined as model traffic. Model traffic consists of forcasted traffic volume as
16
assigned by the urban model on the future 2010 roadway network. Similar to Test 1, the
Standards allow the level of service to be exceeded by 5% of level of service D provided no one
project can utilize more than 1/5 of the 5%. In addition, Test 2 requires all projects that generate
more than 7,000 net daily trips to utilize the model for traffic assignment and level of service
determination.
From Table 2B of the code, the maximum radius of development influence for the generated
4788 trips/day is 2 miles. Therefore, all roadway segments within 2 miles from the site need to
be lower than Test 2's capacity. The Palm Beach County's List of Roadway Segments Failing
Test 2 was reviewed and no roadway links fail Test #2 within 2 miles from the site.
The proposed development passes Test #2.
CONCLUSIONS AND RECOMMENDATIONS
From performing Test 1, Alternate Test I and Test 2 the proposed development conforms with
the 1990 Palm Beach Countywide Traffic Performance Standards. We recommend that the
project be granted a Site Development Order.
The proposed development will be phased to the six lane construction of Lantana Road from
Military Trail to Congress Avenue, and Gateway Boulevard from Military Trail to Congress
Avenue. The proposed development can be built immediately up to 1084 trips per day without
causing traffic impacts that would require roadway improvements.
17
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