§ 34-171. Roadway design standards.

All streets to be established in a subdivision shall be designed in accordance with the latest editions of the Orange County Road Construction Specifications and the Florida Department of Transportation Manual of Uniform Minimum Standards for Design, Construction and Maintenance for Streets and Highways (Green Book) and the following minimum standards:

(1)

Right-of-way width. The minimum right-of-way width shall be as listed below, or of sufficient width to provide for adequate ultimate drainage facilities, utilities, and sidewalks, whichever is greater:

Rural (feet)	Urban (feet)
60	50

 

Additional right-of-way may be required to accommodate design cross sections.

(2)

Pavement width. The minimum pavement widths shall be determined by the average daily traffic (ADT), measured in vehicles per day (vpd), projected for the roadway and shall be in accordance with the following:

Average Daily Traffic (vpd)	Pavement Width (in feet)
Residential:
0— 300	18
301— 800	20
801—1500	22
1501—3500	24*
3501—10,000	24
Commercial/Industrial:	28
Over 10,000	48†

 

*;hg;With dedicated access and left turn lane

†;hg;With dedicated access and left turn lane and median

Minimum pavement width for one-way roadway shall be seventeen (17) feet.

Minimum median width shall be fifteen and one-half (15.5) feet back of curb to back of curb.

Note: Pavement widths shall be measured exclusive of curbs. All roads shall be designed with either Type "A," "B" or "C" curbs. Median curb shall be designed along all medians. All median curbs shall meet FDOT standards.

(3)

Vertical alignment. The vertical alignment of streets in a subdivision shall be subject to the following:

a.

Vertical curves shall be required where the algebraic difference in intersecting grades equals or exceeds the following values:

AverageDaily Traffic (vpd)	Algebraic Difference (percentage)
0 — 3,500	1.20
Over 3,500	1.00

 

b.

All vertical curves shall be of sufficient length to provide a safe stopping sight distance compatible to the design speed of the roadway. Minimum length of all vertical curves shall be one hundred (100) feet.

c.

The minimum grade for subdivision streets with curb and gutter shall be twenty-four hundredths (0.24) percent.

d.

Minimum cross slopes and/or super-elevation rates of .0208 feet/foot (one-quarter-inch/foot) shall be utilized for the design of all roadways.

(4)

Horizontal alignment. The horizontal alignments of streets in a subdivision shall be subject to the following:

a.

The minimum radius of inside edge of pavement at right angle curves internal to subdivisions will be thirty-five (35) feet.

b.

A two-hundred-seventy-five (275) foot minimum radius shall be used on all streets with an ADT of three thousand five hundred (3,500) vpd or greater, unless super-elevation of the roadway is incorporated in the design.

(5)

Pavement requirements. The requirements for pavements of streets in a subdivision shall be subject to the following unless a specific pavement design has been approved by the county engineer:

a.

Subgrade. The subgrade shall be constructed in accordance with Orange County Road Construction Specifications and shall be compacted to ninety-five (95) percent of the maximum density as determined by AASHTO T-180 test method. In addition, the top six (6) inches shall be stabilized to a minimum Florida Bearing Value of 50 under curb areas and under limerock base.

b.

Base course. The base course shall be constructed in accordance with the Orange County Road Construction Specifications. Subject to the recommendation of the county engineer, base course materials may be either limerock or soil-cement with a minimum thickness as follows:

Type of Development	ADT (vpd)	Base Thickness
Residential	<1500	6″
	1500—3,500	8″
	>3,500	10″
Commercial/ Industrial	<1,500	8″
	>1,500	10″

 

c.

Surface course for flexible pavements. Asphaltic concrete surface courses shall comply with the county road specifications, latest edition, and shall meet the following minimum average thickness requirements:

Type of Development	ADT (vpd)	Thickness
Residential	<1,500	1″
	1,500—3,500	1½″
	>3,500	2½″
Commercial/ Industrial	<1,500	1½″
	>1,500	2½″

 

d.

For any entrance intersection improvement, the pavement section shall match the pavement section for the existing roadway.

(6)

Return radii. The return radii for intersections in a subdivision shall be as follows:

a.

Point of measurement:

1.

Urban sections: Face of curb or flow line.

2.

Rural sections: Edge of pavement.

b.

Minimum requirements:

Type of Development	ADT (vpd)	Min. Radius* (feet)
1. Residential:	<3,500	25
	>3,500	35
2. Commercial and Industrial:		50

 

*;hg;Minimum radius of returns shall be based on AASHTO requirements for the type vehicle predominant to the industry considered.

(7)

Sidewalks. All subdivisions shall have four-foot concrete sidewalks on both sides of all streets except streets projected to carry in excess of an ADT equal to three thousand five hundred (3,500) vpd which shall have five-foot concrete sidewalks. All sidewalks shall be located within the street right-of-way. Sidewalks shall be a minimum of four (4) inches in thickness, except at driveways where the required thickness is six (6) inches. Sidewalks shall be designed to include handicapped ramps at all intersections. On a case by case basis, upon approval from the county engineer, a developer may make a voluntary contribution to a sidewalk fund to pay for construction of sidewalks in lieu of actual construction of sidewalks. The amount of the contribution shall be on a per foot basis, as may be approved from time to time by the county engineer.

(8)

Bridges. Bridges shall be constructed of precast concrete, prestressed concrete, cast-in-place concrete, composite concrete and steel, or steel.

a.

Bridge design shall conform to the design criteria of the latest edition, AASHTO Standard Specifications for Highway Bridges.

b.

Prior to design of bridges, the project engineer shall submit design load criteria to the county engineer for approval.

c.

Materials and methods of construction shall conform to the Florida Department of Transportation Standard Specifications for Road and Bridge Construction, latest edition.

(9)

Clearing. All roadway rights-of-way shall be cleared and grubbed in accordance with Orange County Road Construction Specifications, latest edition, unless plans for selective clearing and grubbing are submitted and approved by the county engineer.

(Ord. No. 91-29, § 2(Exh. A), 12-10-91; Ord. No. 94-4, § 1(Exh. A), 2-8-94; Ord. No. 96-2, § 7, 1-9-96; Ord. No. 2000-14, § 1, 6-27-00)