New York State Department of Transportation
ENGINEERING BULLETIN
EB 13-030
Expires one year after issue unless replaced sooner
Title: HIGHWAY DESIGN MANUAL REVISION N0. 73 - CHAPTER 2 - DESIGN CRITERIA Target Audience: Manufacturers (18) Local Govt. (31) Agencies (32)
Surveyors (33) Consultants (34) Contractors (39) ____________(
Approved:
/s/Stephen A. Zargham___________ )
Stephen A. Zargham, PE Director, Design Quality Assurance Bureau
ADMINISTRATIVE INFORMATION: • This Engineering Bulletin (EB) is effective beginning with projects submitted for design
• •
approval on or after January 1, 2014, but designers may begin implementation before the effective date. Superseded Issuances: None Disposition of Issued Materials: These changes will be incorporated into the Highway Design Manual, Chapter 2 by this revision.
PURPOSE: The purpose of this EB is to announce the availability of Revision 73 to the
Highway Design Manual (HDM) – Chapter 2 – Design Criteria. TECHNICAL INFORMATION:
•
•
HDM Exhibit 2-9 Traveled Way Widths for Ramps and Turning Roadways is revised to: 1) Simplify the traveled way width determination by providing one table for interstate ramps and another table for non-interstate ramps and turning roadways, including non-interstate highways that are designated as Qualifying Highways (see HDM section 2.5.3.2). This results in minimum and economical traveled way widths while meeting AASHTO recommendations for large vehicle accommodation. Since Exhibit 2-9a directly addresses the requirements for the interstate tractor trailer (WB-67/WB20), Condition D is no longer needed. 2) Update the values and instructions to reflect guidance in the 2011 AASHTO Green Book; 3) Correct errors in the traveled way width values in the previous version of HDM Exhibit 2-9. Highway Design Manual (HDM) Section 2.7.5.2B Lane Width is revised to read: “B. Traveled Way Width Determine minimum traveled way width from Exhibits 2-9a or 2-9b, as appropriate. Use Exhibit 2-9a for interstate ramps and Exhibit 2-9b for non-interstate ramps and turning roadways, including non-interstate highways that are designated as Qualifying Highways.”
9/03/13 Date
EB 13-030 Page 2 of 2 •
•
Typographical errors on 2 additional pages have been corrected. On page 2-37 Note 7 has been corrected to read “For bridges, determine the lane and shoulder width from the NYSDOT Bridge Manual, Section 2.” On page 2-49 the last 2 bullets next to the text have been removed. The text remains. A correction was made on page 2-27. The following language was added under Grade in Section 2.7.2.1 E to correct a previous omission: “Determine maximum from Exhibit 23”.
TRANSMITTED MATERIALS:
•
Revised Exhibits 2-9a and 2-9b and a metric version (Exhibits M2-9a and M2-9b) are available at: https://www.dot.ny.gov/divisions/engineering/design/dqab/hdm/chapter-2 Revision to HDM Section 2.7.5.2B Lane Width is also available at the above link.
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The pages modified by this revision can be found in the HDM Revisions Log at: https://www.dot.ny.gov/divisions/engineering/design/dqab/hdm/hdm-revised-logs
CONTACT: Direct questions regarding this issuance to Mary Ricard, PE
(
[email protected]) of the Design Quality Assurance Bureau.
HIGHWAY DESIGN MANUAL Chapter 2 Design Criteria
Revision 73 (Limited Revision)
September 3, 2013
Section
Changes
2.7.2.1
Language was added under Grade in item E to correct a previous omission: “Determine maximum from Exhibit 2-3”.
Exhibit 2-5
Typographical error corrected in Note 7 to read “For bridges, determine the lane and shoulder width from the NYSDOT Bridge Manual, Section 2.”
2.7.5.2A
Removed the last 2 bullets next to the text. The text remains.
2.7.5.2B
Revised to properly refer to revised Exhibits 2-9a and 2-9b.
Exhibit 2-9
Changed to simplify the traveled way width determination by providing one table for interstate ramps and another table for non-interstate ramps and turning roadways, including non-interstate highways that are designated as Qualifying Highways. Eliminates the need for traffic condition D.
Exhibit 2-9
Updates the values and instructions to reflect guidance in the 2011 AASHTO Green Book.
Exhibit 2-9
Corrected errors in the traveled way width values.
9/3/2013
2.9
REFERENCES ............................................................................................................. 2-65
APPENDIX A- METRIC VALUES FOR STANDARDS ............................................................. 2-66 M2.7.1 Interstates and Other Freeways ........................................................................... 2-66 M2.7.2 Arterials ................................................................................................................ 2-71 M2.7.3 Collector Roads and Streets ................................................................................ 2-79 M2.7.4 Local Roads and Streets ...................................................................................... 2-86 M2.7.5 Other Roadways ................................................................................................... 2-93
LIST OF EXHIBITS Exhibit 2-1 2-1a 2-2 2-3 2-4 2-5 2-6 2-7 2-8 2-9a 2-9b 2-10 2-11 2-12 2-13 2-14 2-15 2-16
Title Page Functional Classification of Highways - Various Sources ........................................... 2-7 Horizontal Clearance ................................................................................................ 2-18 Design Criteria for Interstates and Other Freeways ................................................. 2-26 Design Criteria for Rural Arterials.............................................................................. 2-29 Design Criteria for Urban Arterials ............................................................................ 2-33 Design Criteria for Rural Collectors ........................................................................... 2-37 Design Criteria for Urban Collectors.......................................................................... 2-41 Design Criteria for Local Rural Roads ....................................................................... 2-44 Design Criteria for Local Urban Streets..................................................................... 2-48 Traveled Way Widths for Interstate Ramps............................................................. 2-53a Traveled Way Widths for Non-Interstate Ramps and Turning Roadways ............... 2-53b Design Criteria for Turning Roadways ...................................................................... 2-54 Minimum Radii and Superelevation for Low-Speed Urban Streets ........................... 2-57 Minimum Radii for Design Superelevation Rates, Design Speeds, and emax = 4% ... 2-58 Minimum Radii for Design Superelevation Rates, Design Speeds, and emax = 6% ... 2-59 Minimum Radii for Design Superelevation Rates, Design Speeds, and emax = 8% ... 2-60 Nonstandard Feature Justification Form ................................................................... 2-63 Design Criteria Table ................................................................................................ 2-64
M2-2 M2-3 M2-4 M2-5 M2-6 M2-7 M2-8 M2-9a M2-9b M2-10 M2-11 M2-12 M2-13 M2-14
Design Criteria for Interstates and Other Freeways ................................................. 2-70 Design Criteria for Rural Arterials.............................................................................. 2-74 Design Criteria for Urban Arterials ............................................................................ 2-78 Design Criteria for Rural Collectors ........................................................................... 2-81 Design Criteria for Urban Collectors.......................................................................... 2-85 Design Criteria for Local Rural Roads ....................................................................... 2-88 Design Criteria for Local Urban Streets..................................................................... 2-92 Traveled Way Widths for Interstate Ramps............................................................. 2-97a Traveled Way Widths for Non-Interstate Ramps and Turning Roadways ............... 2-97b Design Criteria for Turning Roadways ...................................................................... 2-98 Minimum Radii and Superelevation for Low-Speed Urban Streets ......................... 2-101 Minimum Radii for Design Superelevation Rates, Design Speeds, and emax = 4% . 2-102 Minimum Radii for Design Superelevation Rates, Design Speeds, and emax = 6% . 2-103 Minimum Radii for Design Superelevation Rates, Design Speeds, and emax = 8% . 2-104
9/3/2013
2-27
DESIGN CRITERIA 2.7.2
Arterials
2.7.2.1 Rural Arterials The design criteria for undivided and divided rural arterials are: A. Design Speed The design speed is either: maximum functional class speed or a speed based on the anticipated (post-construction) off-peak 85th percentile speed within the range of functional class speeds as shown below. Refer to Section 2.6.1 for guidance on design speed and Chapter 5 of this manual, Section 5.2.4 for methods to determine the off-peak 85th percentile speed. The following are the range of design speeds. Terrain
Minimum Design Speed
Maximum Design Speed
Level
40 mph
60 mph
Rolling
40 mph
60 mph
Mountainous
40 mph
50 mph
B. Lane Width Determine from Exhibit 2-3. C. Shoulder Width Determine from Exhibit 2-3. D. Bridge Roadway Width Determine from NYSDOT Bridge Manual, Section 2. Note that the bridge roadway width includes the lane and shoulders and is often based on the approach lane and shoulder width determined from Sections B and C, above. E. Grade Determine maximum from Exhibit 2-3. F. Horizontal Curvature Determine minimum radius from Exhibit 2-3. For curves flatter than the minimum radius, the radius and superelevation on each horizontal curve shall be correlated with the design speed in accordance with the appropriate emax table (Exhibit 2-13 for e max. = 6% or Exhibit 2-14 for emax. = 8%). G. Superelevation 8% maximum. A 6% maximum may be used in suburban areas to minimize the effect of negative side friction during peak periods with low travel speeds. 9/3/2013
§2.7.2.1
DESIGN CRITERIA
2-37
Exhibit 2-5 Design Criteria for Rural Collectors 1,7
Design Speed (mph)
Travel Lane Width (ft.) Based on Design Year ADT ADT Under 400
ADT 4001500
ADT 15003 2000
ADT Over 3 2000
Turn Lane (ft.)
Minimum Desirable
Maximum Percent Grade
2
Level
Rolling
Mountainous
Min. Stopping Sight Distance (ft.)
Terrain
Min. Radius Curve (ft.) emax = 6%
Min. Radius Curve (ft.) emax = 8%
20
10
4
10
11
12
7
10
12
115
81
76
25
10
4
10
11
12
7
10
11
155
144
134
30
10
4
10
11
12
7
9
10
200
231
214
35
10
4
10
11
12
7
9
10
250
340
314
40
10
4
11
11
12
7
8
10
305
485
444
45
10
4
11
11
12
7
8
10
360
643
587
50
10
4
11
11
12
6
7
9
425
833
758
10
Match Travel Lane Width
55
11
11
12
12
6
7
9
495
1060
960
60
11
11
12
12
5
6
8
570
1330
1200
Shoulder Width (ft.)
All Speeds
9/3/2013
2
5
5
6
6
7
8
Notes: 1. Routes designated as Qualifying Highways on the national network of Designated Truck Access Highways require 12 ft. travel lanes. 2. Short lengths of grade in rural areas, such as grades less than 490 ft. in length, one—way downgrades, and grades on low-volume (