Traffic and Highway Engineering

Nicholas J. Garber and Lester A. Hoel

9781133605157

Fifth Edition

Errata for First Printing

Page Number Correction Description

70 In Equation 3.10, a negative sign should be inserted before “1/β”

90 In the caption for Figure 3.9, change “Problem 3-24” to “Problem 3-25”

248 Change Problem 5-18 to the following:

A safety study will be conducted at a divided rural multilane roadway segment. For

the data given below, determine:

i. The total estimated average crash frequency on the segment

ii. The fatal-and-injury average estimated crash frequency on the segment

iii. The overdispersion parameters for (i) and (ii)

Data:

Length of road segment = 8450 ft

AADT = 6750 veh/day

Lane width = 12 ft

Shoulder width = 8 ft

Median width = 30 ft

No lighting

No automated speed enforcement

Possible injury crashes are not included

249 Change Problem 5-19 to the following:

A state transportation agency wants to evaluate engineering countermeasures

applied to a two-lane, two-way rural highway segment. This 4-mile segment has been

identified as having 14, 19, and 23 total crashes in the last three years, before the

implementation of the countermeasures. The AADT at the segment for the last three

years is 5,630 vehicles per day, and the AADT for after implementation is 6,240

vehicles per day. Compute the expected average crash frequency for the after period,

assuming the treatment was not implemented. The segment has the same conditions

as the base conditions established for the SPF.

249 Change Problem 5-23 to the following:

A two-lane rural highway, four-leg intersection will have its stop control replaced by a

signal control. Compute the expected average total crash frequency (all types, all

severities) after the change for the following conditions:

Expected average crash frequency before change: 23 total crashes/yr

AADT on minor road: 1500 veh/day

AADT on major road: 5000 veh/day

280 In the first equation on the page, change “k2 – q1” to “k2 – k1”

298 The table used for Problem 6-1 should be changed as follows:

Vehicle Section XX Section YY

A T0 T0 + 7.6 sec

B T0 + 3.4 sec T0 + 9.9 sec

C T0 + 7.9 sec T0 + 14.6 sec

D T0 + 12.0 sec T0 + 20.4 sec

E T0 + 14.9 sec T0 + 21.7 sec

300 The table used for Problem 6-10 should be changed as follows:

Speed (mi/hr) Density (veh/mi)

58.8 21

48.8 31

41.4 38

39.1 41

36.7 44

35.1 48

30.8 53

29.3 55

26.5 63

24.3 68

300 The table used for Problem 6-13 should be changed as follows:

Speed (mi/h) Density (veh/mi)

55 18

52 25

43 41

38 58

26 71

19 88

17 99

301 In Problem 6-16, change “25 mph” to “15 mph”

302 In Problem 6-26, change “30 mi/h” to “30 veh/h”

358 In Table 7.13, change “Distance Along Railroad from Crossing, dH (ft)” to “Distance

Along Railroad from Crossing, dT (ft)”

397 In Equations 8.13 and 8.14, change “tps” to “tpr”

444 In Problem 8-15, change the reference for “Problem 8-8” to “Problem 8-11”

451 In the line beneath Equation 9.1e, change “flow rate” to “speed”

451 On the last line of the page, after “(ramps per mile)” add “Computed as the number

of on and off ramps within 3 miles upstream and downstream of the midpoint of the

segment divided by 6.”

452 In Equation 9.3, change the variable “y” to “v”

465 In Step 5 of Example 9.5, in the line before Step 6 change the variable “y” to “v”

465 In Example 9.5, the last part of Step 6 should read:

“To operate at a LOS = C, use three lanes in the upgrade direction. Repeat the process

for the downgrade section to show that two lanes are required to operate at a LOS =

C. Note that for downgrades, RVs are treated as if on level terrain.”

468 Two lines under Equation 9.6d, change “flow rate” to “speed”

468 Eight lines under Equation 9.7, change “adjustment for median type (mi/h) (Table

9.9)” to “adjustment for median type (mi/h) (Table 9.8)”

472 In the final line of Step 5 of Example 9.6, change “24.5 pc/h/ln” to “24.5 pc/mi/ln”

480 In Equation 9.13, change “vvo,ATS” to “vo,ATS”

481 Two lines before “Estimate the PTSF” change “Table 9.22” to “Table 9.24”

481 In Equation 9.16, change “fd” to “Fd” and change “{“ to “[“

482 Under heading “Determine LOS and Capacity,” for both instance of “Class III,” change

“PFFS” to “ATS”

485 In the first equation change “fd” to “Fd”

562 In Equation 10.92, change “Ln” to “ln”

685 In Problem 12-11, change the “200” value in column “2” to “150”

688 The following trip table should be used with Problem 12-25

688 The following trip table should be used with Problem 12-26

704 In the initial equation for NPWI, add “+ 3000” before “+ 500”

805 Change Equation 15.24 to the following:

)1( 1

cos2

E R= −∆

832 In Problem 15-10, change “PVC” to “BVC”

959 In Problem 17-13, change the following values as shown:

No. 4: 100 No. 40: 70

960 In Problem 17-14, change the following values as shown:

No. 4: 100 No. 40: 96

960 In Problem 17-15, change the following values as shown:

No. 4: 100 No. 40: 89

960 In Problem 17-16, change the following values as shown:

No. 4: 100 No. 40: 63 No. 200: 13

995 The caption for Figure 18.13 should reference “page 1001” rather than “page 999”

1017 In Example 18.4, the answer should be “71.18oC” rather than “17.18oC”

1037 The table for Problem 18-8 should read as follows:

Material Percent by Weight Bulk Specific Gravity

A 38 2.62

B 42 2.58

C 12 2.63

D 8 2.54

1037 The table for Problem 18-10 should read as follows:

Material Specific Gravity Mix Composition by Weight of Total Mix

Asphalt cement 1.06 6.5

Coarse aggregate 2.55 51.5

Fine aggregate 2.66 34.8

Mineral filler 2.64 7.2

1085 In Problem 19-7, change the CBR from “85” to “8.5”

1085 In Problem 19-8, change the CBR from “90” to “9.0”

1085 In Problem 19-9, change the CBR from “75” to “7.5”. At the end of the problem add

“Assume the design lane factor fd is 0.42.”

1086 In Problem 19-16 add “The base has an R value of 80.”