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Publication Number:  FHWA-HRT-13-077    Date:  January 2014
Publication Number: FHWA-HRT-13-077
Date: January 2014

 

Safety Effects of Horizontal Curve and Grade Combinations on Rural Two-Lane Highways

Date: November 16, 2014
Issuing Office: Federal Highway Administration—Office of Research, Development, and Technology: Safety Research and Development
Address: Turner-Fairbank Highway Research Center, 6300 Georgetown Pike, McLean, VA 22101
Name of Document: Safety Effects of Horizontal Curve and Grade Combinations on Rural Two-Lane Highways
FHWA Publication No.: FHWA-HRT-13-077

The following changes were made to the document after publication:

Location Incorrect Values Corrected Values
Page i, Block 21 63 68
Page 4, SAFETY EFFECTS OF HORIZONTAL ALIGNMENT, Paragraph 1, Sentence 1, Line 2 follows shown in figure 2
Page 4, SAFETY EFFECTS OF HORIZONTAL ALIGNMENT, Paragraph 1, Sentence 1, Figure 2 N = [1.55 (LC)(V) + 0.014(D)(V) − 0.012(S)(V)](0.978)W − 30 N = [1.55 (LC)(V) + 0.014(D)(V) − 0.012(S)(V)](0.978)W − 30
Page 5, Paragraph 3, Sentence 2 in the following form: shown in figure 3:
Page 5, Paragraph 6, Sentence 1 in the following form: as shown in figure 4:
Page 8, Paragraph 1, Sentence 10 (A = abs(G1 – G2)) [A = abs(G1 – G2)]
Page 9, DESCRIPTIVE STATISTICS, Paragraph 1, Sentence 1 (million vehicle miles traveled in the 6-year period (MVMT)) [million vehicle miles traveled in the 6-year period (MVMT)]
Page 14, Paragraph 2, Bullet 2 (this is a standard analysis of variance (ANOVA) using an NB distribution and a log link) [this is a standard analysis of variance (ANOVA) using an NB distribution and a log link]
Page 16, Paragraph 2, Sentence 1 follows shown in figure 6 and figure 7
Page 16, Paragraph 4, Bullet 1,Sentence 2 follows shown in figure 8
Page 17, Horizontal Curves and Tangents on Straight Grades, Paragraph 1,Sentence 1, Bullet 1 (number of roadway segments (N) = 8,095 and total roadway length = 595 mi) [number of roadway segments (N) = 8,095 and total roadway length = 595 mi]
Page 17, Horizontal Curves and Tangents on Straight Grades, Paragraph1, Sentence 1 (i.e., number of roadway sections); total roadway length; and minimum, maximum, mean, and median values for specific parameters) (i.e., number of roadway sections; total roadway length; and minimum, maximum, mean, and median values for specific parameters)
Page 18, Paragraph 1, Sentence 1 follows shown in figure 10 and figure 11
Page 20, Paragraph 5, Sentence 1 follows shown in figure 12, figure 13, and figure 14
Page 23, Paragraph 1, Sentence 1 as follows shown in figure 16 and figure 17
Page 25, Paragraph 2, Sentence 1 follows shown in figure 18 and figure 19
Page 26, Paragraph 1, Sentence 2 follows shown in figure 20 and figure 21
Page 28, Paragraph 1, Sentence 1 follows shown in figure 23 and figure 24
Page 29, Paragraph 5, Sentence 1 follows shown in figure 25 and figure 26
Page 30, Paragraph 2, Sentence 3 follows shown in figure 27 and figure 28
Page 32, Paragraph 1, Sentence 1 follows shown in figure 30 and figure 31
Page 33, Paragraph 4, Sentence 1 follows shown in figure 32 and figure 33
Page 36, Paragraph 1, Sentence 1 follows shown in figure 35 and figure 36
Page 37, Paragraph 4, Sentence 1 follows shown in figure 37 and figure 38
Page 39, HORIZONTAL CURVES AND TANGENTS ON STRAIGHT GRADES, Paragraph 1, Sentence 1 follows shown in figure 39 and figure 40
Page 42, HORIZONTAL CURVES AND TANGENTS AT TYPE 1 CREST VERTICAL CURVES, Paragraph 1, Sentence 1 follows shown in figure 43 and figure 44
Page 44, HORIZONTAL CURVES AND TANGENTS AT TYPE 1 SAG VERTICAL CURVES, Paragraph 1, Sentence 1 follows shown in figure 47 and figure 48
Page 46, HORIZONTAL CURVES AND TANGENTS AT TYPE 2 CREST VERTICAL CURVES, Paragraph 1, Sentence 1 follows shown in figure 51 and figure 52
Page 48, HORIZONTAL CURVES AND TANGENTS AT TYPE 2 SAG VERTICAL CURVES, Paragraph 1, Sentence 1 follows shown in figure 55 and figure 56
Page 50, CMFs FOR COMBINED CRASH SEVERITY LEVELS, Paragraph 1, Sentence 3 follows shown in figure 59

 

Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC 20590 | 202-366-4000
Turner-Fairbank Highway Research Center | 6300 Georgetown Pike | McLean, VA | 22101