Traffic Calming Policy

Village of Palmetto Bay | Village wide Traffic Calming Study

 2.0   TRAFFIC CALMING ANALYSIS METHODOLOGY

 The methodology and criteria defined in this study are described below as per agreement between the 
Village of Palmetto Bay and Miami-Dade County. The Village opted to use the City of Miami Beach 
Traffic Calming Manual which was previously approved by Miami-Dade County’s Department  
of Transportation and Public Works (DTPW).  In addition, an Intergovernmental Agency  
Agreement, presented in Appendix C, was signed between Miami-Dade County and the Village of 
Palmetto Bay enabling the Village to perform traffic functions, install and maintain traffic 
calming devices.

 2.1    General Requirements and Constraints


Speed and traffic volumes are the first criteria used to gauge whether a traffic calming study area 
warrants further research for possible development and implementation of a traffic  
calming plan. Table 1 shows the thresholds established for Palmetto Bay regarding speed and volume 
and points assigned to each range.

Table 1. Traffic Calming Thresholds for speed and Volume
Points             Speed*(mph)          Points            Volume (vpd) **                  
0.5                 < 4.6                          0.5                  500 – 750
1.0                 4.6 to 7.5                   1.0                  751 – 1,100
1.5                7.6 to 10.5                  1.5                  1,101 – 1,700
2.0                10.6 to 13.5                2.0                  1,701 – 2,300
2.5                13.6 to 16.5                2.5                   > 2,300
3.0                > 16.5 mph

* 85th percentile speed is above the posted speed limit. The 85'"percentile speed is defined as 
"the speed that is exceeded by 15% of the motorist surveyed".
** Vehicles per Day

MARLIN |1700 NW 66th Avenue, Suite 106 | Plantation, FL 33313 | www.marlinengineering.com

The second criterion, as shown in Table 2, establishes the number of accidents per year on the 
village streets as a warrant for traffic calming eligibility. Crash data for the last 3 years (2014 
to 2016) of available data was analyzed, and points assigned.

Village of Palmetto Bay | Village-wide Traffic Calming Study

Table 2. Traffic Calming Thresholds for Number of Accidents
Point                No. of Accidents 
0.5                         1 - 2
1.0                          = 3
1.5                          > 3

i. Any street that ranks 2.5 points or higher as a sum of both criteria is eligible for 
traffic calming. Finally, a neighborhood street would also require 2/3 voter approval  
from residents, and implementation is subject to final roadway design. The County requires 100% 
approval from property owners adjacent to the proposed site where speed humps as well as other 
calming devices will be installed. Due to the curvature of the roadway, and other unique design 
characteristics, some streets may not be suitable for any or all of the traffic 
calming tools available.

ii. Any street that ranks 2.0 points will be studied by the Village's Transportation  
Engineer to determine if other measures may be helpful in addressing concern.

The following items may be considered, but not limited, as part of the study:
1. Location of school, pedestrian oriented facility (e.g. elderly housing) or community facility (e.g. park) 
located on the subject street or within an established walking area.
2.   Driveway density.
3.   Presence / absence of sidewalks.

After review of the above study, the Village's Transportation Engineer would be able to recommend 
various alternate solutions if the street does not fully qualify for the installation of traffic calming devices.

 iii. Any street that scores less than a 2.0 and is determined to not be an appropriate 
location based on the study completed will not be eligible for re-evaluation for twelve (12) months 
after the speed/volume study is conducted. After two (2) years of testing, if the street does not 
qualify for traffic calming, the project is ineligible for re-testing for twenty-four (24) months.

In addition to the listed operational criteria, the following restrictions are also imposed:
•   Roadway shall be local residential streets and generic residential collectors.
•   The posted speed limit may not be more than 30 mph (local residential streets) or 35 mph 
(residential collectors).
•   Roadway shall be local residential streets with only two lanes of travel.
•   Roadway shall not be used as a primary route for emergency or fire rescue vehicles.
•   Roadway shall not have curves or obstacles that would create an unsafe condition  
for motorists driving at the desired speed limit under normal driving conditions.
•   Roadway shall not be a through truck route, unless an acceptable alternative route is 
identified.
•   Pedestrians and/or bicycles safety shall not be adversely affected.
•   Roadway drainage shall not be adversely affected.

3.0   PUBLIC INVOLVEMENT

The objective of the public involvement task is to discuss and receive the input from the residents 
of the Village. Therefore, the Village’s Administration with the support of MARLIN  
provided a set of platforms for residents to express their concerns about traffic issues within 
their neighborhoods. The following public feedback alternatives were available for the residents:
•   Public Meetings
•   Comment Cards
•   Online Surveys
•   E-mails

 The most significant input was received through the “Kick-off” and “Follow up” public  
meetings organized for each one of the designated zones. During the Kick-off meetings, residents 
were able to interact with Marlin’s staff of engineers and planners which presented the Traffic 
Calming Study Plan and collected information about traffic issues pointed out by the residents. The 
follow up meetings provided a second opportunity for direct communication and feedback on the 
status of the study, as well as showing preliminary results from the data collection process. 
Afterwards, a Final Workshop was held at the Village Hall, where the Traffic Calming Master Plan 
was presented to the residents with a Presentation and Open Discussion format.


MARLIN |1700 NW 66th Avenue, Suite 106 | Plantation, FL 33313 | www.marlinengineering.com