Shoulder_Width_Design_Variation_444222-2_County_(3).pdf

2018 Florida Greenbook Design Exceptions and Variations, May 28, 2019 Page 1

TO: Chris Phillips, P.E._________________ DATE: 6/9/2023

SUBJECT: DESIGN EXCEPTION or DESIGN VARIATION

Local road number or street name: Lanier Drive Project description (limits): Toni Street to Creighton Road (State Road 742) Type construction (new, rehabilitation, adding lanes, resurfacing, etc.) Sidewalk Design Speed: 40 MPH State and/or Federal road number (if applicable): Not Applicable FDOT Financial Project ID No. (if applicable): FPID 444222-2-58-01

DESIGN EXCEPTION OR VARIATION FOR THE FOLLOWING ELEMENT:

( ) Design Speed ( ) Stopping Sight Distance ( ) Other (explain):

( ) Lane Width ( ) Maximum Grade __________________

(X) Shoulder Width ( ) Cross Slope __________________ ( ) Horizontal Curve Radius ( ) Vertical Clearance ( ) Superelevation Rate ( ) Design Loading Structural Capacity

Include a brief statement concerning the project and items of concern.

Attach all supporting documentation to this exhibit in accordance with Chapter 14, Florida Greenbook.

The subject Safe Routes to School Sidewalk Project (FDOT Safety Project) is planning to extend sidewalk along Lanier Drive from Toni Street (STA 10+35) to Creighton Road (STA 28+00), for an overall length of

1,765 linear feet. Per the FDOT Florida Greenbook, the minimum sidewalk offset from the roadway should be the grass shoulder point (or eight feet for Lanier Drive). Due to limited right-of-way, it is requested that the effective shoulder width (sidewalk offset) between STA 10+35 and STA 20+00 be reduced to less than eight feet. Recent crash history revealed one non-intersection run-off-the-road crash in this segment, and a bicycle crash that may have been mitigated by the subject sidewalk. Despite this requested deviation from criteria, every effort will be made to widen the shoulder (and offset the sidewalk) as much as possible, in consideration of available right-of-way, utilities and other constraining features.

Recommended by:

(Responsible Professional Engineer)

Approval:

(Maintaining Authority's Professional Engineer or Designee)

Concurrence:

FDOT (if applicable)

Concurrence:

FHWA (if applicable)

2018 Florida Greenbook Design Exceptions and Variations, May 28, 2019 Page 2

Project Purpose:

The purpose of the subject project is to extend the exis�ng sidewalk system serving Holm Elementary School and Workman Middle School. This project is being completed as a FDOT Safety Improvement Project, as part of the FDOT’s Safe Routes to School Program. The project will be a Local Agency Program project, which will be let by Escambia County.

Sidewalk was formally requested for installa�on along the west side of Lanier Drive from Toni Street to Creighton Road. The approximate sta�on limits where sidewalk is planned for installa�on to achieve this sidewalk extension are from STA 10+35 to STA 28+00, for a total length of approximately 1,765 linear feet (LF).

Design Varia�on Request:

Per the governing standards [FDOT’s 2018 Manual of Uniform Minimum Standards for Design, Construc�on and Maintenance for Streets and Highways (aka Florida Greenbook)], ideal sidewalk placement from a roadway is defined in Chapter 8. The minimum sidewalk offset is related to roadway shoulder width, and the offset of some of the proposed sidewalk segments will not meet the minimum suggested offset. This is due to the limited right-of-way along the corridor. This Design Varia�on is therefore being requested to permit an effec�ve narrower shoulder width to allow the sidewalk to be installed closer to the edge of pavement of Lanier Drive.

Criteria:

The Florida Greenbook, Chapter 8, Sec�on C.2.a defines the criteria for placement of sidewalk in the order of desired criteria as follows:

2018 Florida Greenbook Design Exceptions and Variations, May 28, 2019 Page 3

The Florida Greenbook, Table 3-21 (Minimum Shoulder Widths for Flush Shoulder Highways) defines the shoulder width for Two Lane Undivided facili�es as follows:

As the Average Daily Traffic along Lanier Drive exceeds 750 vehicles, the minimum shoulder width for Lanier Drive is eight feet, which is the minimum sidewalk offset that should be provided considering the aforemen�oned criteria.

Proposed Design:

As reflected in the atached Typical Sec�on Package, the right-of-way available along Lanier Drive will support the following typical shoulder widths / sidewalk offsets (with isolated adjustments for intersec�ons and to avoid u�lity conflicts):

Sta�on Limits: Shoulder Width / Sidewalk Offset An�cipated from Edge of Pavement:

STA 10+35 to STA 20+00 (965 LF) Varies: 2 – 8 feet STA 20+00 to STA 28+00 (800 LF) Varies: 8 – 18 feet

Proposed Criteria:

The proposed criteria for this project is to permit the minimum sidewalk offset (or effec�ve grass shoulder point) to be less than eight feet, between STA 10+35 and STA 20+00.

Alterna�ve Design Evalua�on:

Installing an urban sidewalk design consis�ng of curb and guter at the edge of pavement bordered by six-foot wide sidewalk was considered through the subject limits to alleviate the need for mee�ng a minimum shoulder width (sidewalk offset). Based upon the survey data collected for the project, the ground eleva�ons at the right-of-way were slightly higher than those at the edge of pavement, but only by a couple of inches, on average. This shows that the roadside is effec�vely flat, but the roadside drains to the road. Installa�on of curb and guter with six-foot

2018 Florida Greenbook Design Exceptions and Variations, May 28, 2019 Page 4 wide sidewalk will effec�vely result in the back of sidewalk being six inches higher than the edge of pavement, or generally about four inches higher than the ground eleva�on at the right-of-way along the west side of Lanier Drive. This will not only present issues with regrading but moreover it will interfere with drainage paterns as the sidewalk system will restrict off-site drainage and current paterns, leading to drainage issues on private property. Insufficient right-of-way exists within these limits to permit the construc�on of a swale to intercept and reroute these drainage paterns. Acquisi�on of addi�onal right-of-way is not permited with FDOT Safety Projects. The limited right-of-way in combina�on with inadequate topography restricted further considera�on of this alterna�ve.

Safety Review:

A review of all available reported crashes along the en�re subject corridor was completed. All available long form and short form crash incidents reported since the beginning of 2015 and as available in the Signal 4 Analy�cs Database, were reviewed. A total of nine crash reports were available and they are summarized in the following table.

Date Time Approx.

STA

Descrip�on

5/29/16 8:18 AM 11+30 Southbound vehicle ran off roadside and struck garbage cans (Hit & run)

3/3/17 5:38 PM 16+60 Southbound vehicle sideswiped a southbound bicyclist (15 years old) (Hit & run)

4/20/18 6:24 PM 23+30 Eastbound read end at Burgess Road intersec�on 3/11/20 3:26 PM 28+80 Northbound rear end in le� turn lane at Creighton Road intersec�on 6/24/21 8:07 AM 16+80 Vehicle hit stop sign at John Carroll Drive intersec�on (Hit

& run) 7/13/21 2:19 AM 23+30 Eastbound vehicle ran off the road at Burgess Road intersec�on, struck fence and tree (Driver fled) 8/27/21 9:40 PM 19+60 Northbound vehicle crossed southbound lane struck fence along west side of Lanier Drive 10/30/22 10:41 AM 16+80 Angle crash at John Carroll Drive intersec�on 1/15/23 1:26 PM 16+80 Angle crash at John Carroll Drive intersec�on

Between STA 10+35 and STA 20+00 there was one non-intersec�on lane departure crash involving a vehicle striking trash cans near STA 11+30. As the vehicle struck garbage cans then fled, it does not appear that a significant devia�on from the edge of pavement occurred. Within this area, the preliminary sidewalk offset is an�cipated to be approximately seven feet.

Addi�onally, a bicycle crash occurred in 2017 and involved a 15-year-old bicyclist being sideswiped by a southbound vehicle. The planned sidewalk may have mi�gated this crash if it was used by the bicyclist.

2018 Florida Greenbook Design Exceptions and Variations, May 28, 2019 Page 5

Conclusion:

The purpose of this Design Varia�on is to permit the installa�on of sidewalk such that it deviates from the minimum desired offset of eight feet (grass shoulder point) for a segment of the Lanier Drive Sidewalk Project. The overall length of the project is 1,765 feet, and within a 965-foot segment (from STA 10+35 to STA 20+00), the available right-of-way width along Lanier Drive will restrict the shoulder width (sidewalk offset) to less than eight feet.

Despite this requested devia�on from criteria, every effort will be made to widen the effec�ve shoulder (and offset to the sidewalk) as much as possible, in considera�on of available right-of-way, u�li�es and other constraining roadside features.

https://tinyurl.com/yu45e9naPROJECT LOCATION URL:

BEGIN STA. 10+35 - END STA. 28+00

NONE

NONE

NONE

PROJECT LIMITS:

EXCEPTIONS:

BRIDGE LIMITS:

RAILROAD CROSSING:

C W e n c e

NO.

SHEET

APPROVED BY:

FOLLOWING SHEETS IN ACCORDANCE WITH RULE 61G15-23.004, F.A.C.

THE ABOVE NAMED PROFESSIONAL ENGINEER SHALL BE RESPONSIBLE FOR THE

INDEX OF SHEETS

TYPICAL SECTION PACKAGE

STATE OF FLORIDA

DEPARTMENT OF TRANSPORTATION

(FEDERAL FUNDS)

FINANCIAL PROJECT ID 444222-2-58-01

ESCAMBIA COUNTY (48013)

TONI STREET TO SR 742 (CREIGHTON ROAD)

LANIER DRIVE FROM

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FDOT DISTRICT DESIGN ENGINEER

ENGINEER

FDOT DISTRICT TRAFFIC OPERATIONS

DESIGN & POSTED SPEEDS

TARGET SPEED

TYPICAL SECTION ELEMENTS

CONCURRING WITH:

DESIGN & POSTED SPEEDS

TARGET SPEED

CONCURRING WITH:

DEVELOPMENT MANAGER

FDOT DISTRICT INTERMODAL SYSTEMS

DESIGN ENGINEER

FDOT DISTRICT STRUCTURES

TARGET SPEED

CONTEXT CLASSIFICATION

CONCURRING WITH:

TYPICAL SECTION ELEMENTS

CONCURRING WITH:

FHWA TRANSPORTATION ENGINEER LOCAL TRANSPORTATION ENGINEER

TYPICAL SECTION ELEMENTS

CONCURRING WITH:

TYPICAL SECTION ELEMENTS

CONCURRING WITH:

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ON ANY ELECTRONIC COPIES.

AND THE SIGNATURE MUST BE VERIFIED

NOT CONSIDERED SIGNED AND SEALED

PRINTED COPIES OF THIS DOCUMENT ARE

ON THE DATE ADJACENT TO THE SEAL

SIGNED AND SEALED BY

THIS ITEM HAS BEEN DIGITALLY

Orlando, FL 32801-3442 201 S. Orange Ave, Suite 1300 Comprehensive Engineering Services, Inc.

License Number 77587 Christopher Ryan Wence, P.E.

LOCATION OF PROJECT

2 TYPICAL SECTION NO. 1

3 TYPICAL SECTION NO. 2

R/W LINE R/W LINER/W VARIES (33' - 66')

£ SURVEY LANIER DRIVE

0.5'

SOD (1:6 MAX.)

5' 2'

CONCRETE SIDEWALK

SOD (1:6 MAX.)

0.02 (MAX.)

VARIES (21' - 30') VARIES (12' - 36')

(2' MIN.)

SETBACK*

TRAVEL LANE

11'±

NATURAL GROUND NATURAL GROUND

STA. 10+35 TO STA. 23+00

LANIER DRIVE

& GRUBBING

STANDARD CLEARING CONSTRUCTION

LIMITS OFLIMITS OF CONSTRUCTION

NOT TO SCALE

TRAVEL LANE

11'±

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PROJECT CONTROLS TYPICAL SECTION No. 1

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TRAFFIC DATA

DESIGN SPEED = 40 MPH

DESIGN HOUR T = 4.1%

K = 9% D = 56% T = 8.2% (24 HOUR)

ESTIMATED DESIGN YEAR = 2045 AADT = 6500

ESTIMATED OPENING YEAR = 2025 AADT = 4400

CURRENT YEAR = 2023 AADT = 4200

5 - RESTRICTIVE w/440 ft. Connection Spacing

4 - NON-RESTRICTIVE w/2640 ft. Signal Spacing

7 - BOTH MEDIAN TYPES

6 - NON-RESTRICTIVE w/1320 ft. Signal Spacing

2 - RESTRICTIVE w/Service Roads

1 - FREEWAY

3 - RESTRICTIVE w/660 ft. Connection Spacing

NEW CONSTRUCTION / RECONSTRUCTION

ACCESS CLASSIFICATION

CRITERIA

STATE HIGHWAY SYSTEM

( ) NATIONAL HIGHWAY SYSTEM

(X)

HIGHWAY SYSTEM

STRATEGIC INTERMODAL SYSTEM

(X)

( ) LOCAL

(X)

FUNCTIONAL CLASSIFICATION

CONTEXT CLASSIFICATION

C1 : NATURAL

C2 : RURAL

C2T : RURAL TOWN

C6 : URBAN CORE

C5 : URBAN CENTER

C4 : URBAN GENERAL

C3R : SUBURBAN RES.

C3C : SUBURBAN COMM.

OFF-STATE HIGHWAY SYSTEM

RRR (ARTERIALS & COLLECTORS)

RESURFACING (LA FACILITIES)

INTERSTATE

FREEWAY/EXPWY.

PRINCIPAL ARTERIAL

MINOR ARTERIAL

MAJOR COLLECTOR

MINOR COLLECTOR

(X) N/A : OFF-STATE HIGHWAY FACILITY

RELATED TO TYPICAL SECTION:

POTENTIAL EXCEPTIONS AND VARIATIONS

(X)

(OFF-STATE HIGHWAY SYSTEM ONLY)

MANUAL OF UNIFORM MINIMUM STANDARDS (FLORIDA GREENBOOK)

VARIATION - SHOULDER WIDTH

8'+ FROM EDGE OF TRAVEL: STA. 20+00 TO STA. 23+00

4' TO 8' FROM EDGE OF TRAVEL: STA. 11+20 TO STA. 20+00

2' FROM EDGE OF TRAVEL: STA. 10+35 TO STA. 11+20

* SIDEWALK SETBACK

R/W LINE R/W LINER/W 66'

£ SURVEY LANIER DRIVE

SOD (1:6 MAX.)

CONCRETE SIDEWALK

SOD (1:6 MAX.)

0.02 (MAX.)

VARIES (22' - 30') VARIES (36' - 44')

TRAVEL LANE

11'±

NATURAL GROUND

NATURAL GROUND

STA. 20+40 TO STA. 28+00

LANIER DRIVE

TRAFFIC DATA

DESIGN SPEED = 40 MPH

DESIGN HOUR T = 4.1%

K = 9% D = 56% T = 8.2% (24 HOUR)

ESTIMATED DESIGN YEAR = 2045 AADT = 6500

ESTIMATED OPENING YEAR = 2025 AADT = 4400

CURRENT YEAR = 2023 AADT = 4200

NOT TO SCALE

2' 2'5'(8' MIN.)

(18' TYP.)

SETBACK

& GRUBBING

STANDARD CLEARING

LIMITS OF CONSTRUCTION

CONSTRUCTION

LIMITS OF

TRAVEL LANE

11'±

/9

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C W e n c e

FINANCIAL PROJECT ID

NO.

SHEET

PROJECT CONTROLS

5 - RESTRICTIVE w/440 ft. Connection Spacing

4 - NON-RESTRICTIVE w/2640 ft. Signal Spacing

7 - BOTH MEDIAN TYPES

6 - NON-RESTRICTIVE w/1320 ft. Signal Spacing

2 - RESTRICTIVE w/Service Roads

1 - FREEWAY

3 - RESTRICTIVE w/660 ft. Connection Spacing

NEW CONSTRUCTION / RECONSTRUCTION

ACCESS CLASSIFICATION

CRITERIA

STATE HIGHWAY SYSTEM

( ) NATIONAL HIGHWAY SYSTEM

(X)

HIGHWAY SYSTEM

STRATEGIC INTERMODAL SYSTEM

(X)

( ) LOCAL

(X)

FUNCTIONAL CLASSIFICATION

CONTEXT CLASSIFICATION

C1 : NATURAL

C2 : RURAL

C2T : RURAL TOWN

C6 : URBAN CORE

C5 : URBAN CENTER

C4 : URBAN GENERAL

C3R : SUBURBAN RES.

C3C : SUBURBAN COMM.

OFF-STATE HIGHWAY SYSTEM

RRR (ARTERIALS & COLLECTORS)

RESURFACING (LA FACILITIES)

INTERSTATE

FREEWAY/EXPWY.

PRINCIPAL ARTERIAL

MINOR ARTERIAL

MAJOR COLLECTOR

MINOR COLLECTOR

(X) N/A : OFF-STATE HIGHWAY FACILITY

RELATED TO TYPICAL SECTION:

POTENTIAL EXCEPTIONS AND VARIATIONS

TYPICAL SECTION No. 2

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(X)

(OFF-STATE HIGHWAY SYSTEM ONLY)

MANUAL OF UNIFORM MINIMUM STANDARDS (FLORIDA GREENBOOK)