The purpose of this Section is to provide policies and procedures for design and installation of traffic calming devices within unincorporated Seminole County. On October 27, 2020, the Board approved the use of traffic calming devices on County roadways to reduce vehicle speeds. The Board approves the use of the following traffic calming devices on County roadways to control vehicle speeds:
Traffic calming devices will be approved by the County based on the latest Traffic Calming Criteria (see below). As identified in the criteria, the roadway must have a documented issue with speeding.
The following Traffic Calming Criteria must be met before traffic calming devices may be installed on a roadway:
(1) Roadway must have a documented speeding issue, the observed 85th percentile speed is greater than 8 mph over posted speed limit.
(2) The maximum roadway volume must not exceed 3,000 vehicles per day.
(3) The maximum posted speed on the roadway must not exceed 30 mph.
(4) 65% of all property owners along the roadway where the traffic calming devices are being installed must vote to approve the installation.
(5) Functional spacing of devices (primarily for speed cushions or humps) is based on the following guidelines:
(6) Roadway must have driveways that directly access the road.
(7) Roadway must not be a principal arterial, minor arterial or major collector roadway. Roadway must be a local street or minor collector that is evaluated on a case-by-case basis.
(8) Traffic calming devices should not be placed on any roadway that is a primary or routine response route for emergency vehicles, including departure routes from a fire station.
(9) Traffic calming devices must not increase response times by more than one minute or the total travel time to the furthest protected structure along the response route to more than 5 minutes.
The above criteria applies to the following traffic calming devices: speed cushions (in addition to Section C below), mid-block chokers, chicanes, median/center islands and certain other devices from the 2005 Traffic Calming Program manual, such as mid-block chokers, chicanes and median/center islands. Other devices in the manual, such as, roundabouts, traffic circles and gateway/entry features, may have different criteria to be determined by the County Traffic Engineer or County Engineer on a case by case basis if those devices were desired.
Nothing above limits the County Traffic Engineer’s or County Engineer’s ability to install any devices upon the County roadway system that in their sole opinion is justified for the maximum safety of the motorists or residents and does not impede Public Safety operations.
C: SPECIFIC SPEED CUSHION DESIGN CONSIDERATIONS
Speed cushions must be designed to reduce as much as possible the impact to emergency vehicle response times. The following design considerations are to be used and any cushions installed on County roadways shall be approved by the County Engineer or County Traffic Engineer. Cushions may be fabricated from pre-fabricated rubber pieces, similar to Traffic Logix Speed Cushions or equal, or in-place constructed asphalt sections. Cushions should be made up of two (2) or three (3) sections for each location along the roadway. The width of the section must be six feet (6’) and they must be installed with two foot (2’) gaps between sections. The length of the sections shall be twelve feet (12’) or longer to set the desired speed over the cushion. The general design of cushions will be subject to approval by the County Engineer or County Traffic Engineer. The City of Orlando’s Speed Cushion design, was used as a template.
D: OPPORTUNITIES FOR CREATING MUNICIPAL SERVICES BENEFIT UNITS (MSBUs) TO INSTALL TRAFFIC CALMING DEVICES IN COMMUNITIES
Communities seeking information on the possible creation of MSBUs for installation of traffic calming devices should refer to Section 22.10 of this Code.
E: REMOVAL OF TRAFFIC CALMING DEVICES
Approval of 65% of the property owners along the roadway where traffic calming devices are located is necessary for the Board to consider removal of any traffic calming devices.
F. AUTHORITY
Resolution 2020-R-118 adopted October 27, 2020
Resolution 2024-R-55 adopted March 5, 2024
The Board recognizes there is no dedicated funding for any traffic calming devices at this time. The Board may decide to dedicate funding in the future through a budgeted program or through individual projects. In the absence of County funding or assistance, communities may receive County approval to design and install traffic calming devices through the County’s Municipal Service Benefit Unit (MSBU) program.
What is an MSBU? An “MSBU” (Municipal Service Benefit Unit) is a non-ad valorem assessment district created to fund a public service or capital improvement. An MSBU consists of a group of properties that share in the benefit and cost of the service provided. The assessment allocated to each property is based on the service cost, total number of benefit units and the number of benefit units assigned to each property. A benefit unit may be a parcel, dwelling, linear foot or other equitable unit. In short, you and your affected neighbors will pay an amount annually for a determined number of years to fund the traffic calming measures desired for your roadway. More information on the MSBU program.
The cost for speed cushions varies depending on the material. Pre-fab rubber cushions that were used at the County’s four (4) pilot project locations were $6,200 per location. This was for a set of two (2) that were good for a roadway width of 24’ or less. Assuming 300’-400’ spacing between locations, rubber cushions are roughly $93,000 per mile. Asphalt cushions are significantly less expensive at about $4,000 per location or $60,000 per mile. The other traffic calming device options, #2 through #7 above, are significantly more expensive, current estimated costs.
A: TRAFFIC CALMING EVALUATION PROCESS
The following process applies to the County’s evaluation of speeding complaints and Traffic Calming Devices for a particular roadway:
Seminole County Traffic Calming Request Form
FOR MORE INFORMATION ON TRAFFIC CALMING,
PLEASE CONTACT TRAFFIC ENGINEERING AT (407) 665-5677.