(a) A rural collector in rolling terrain of St Vincent is to be designed in the year 2023 to carry a daily hourly vehicle of 120 veh/hr with 95 % passenger cars. With the aid of the Tables provided in Appendix 1, and using metric units, determine: A suitable design speed; i. ii. iii. iv. V. Maximum desirable grade; Minimum radius of horizontal curvature if given a super elevation of 10% and a side friction factor is 0.09; Minimum length of crest vertical curves if both tangents radius is ± maximum desirable grade, and Minimum length of sag vertical curves, for the maximum grade.
(a) A rural collector in rolling terrain of St Vincent is to be designed in the year 2023 to carry a daily hourly vehicle of 120 veh/hr with 95 % passenger cars. With the aid of the Tables provided in Appendix 1, and using metric units, determine: A suitable design speed; i. ii. iii. iv. V. Maximum desirable grade; Minimum radius of horizontal curvature if given a super elevation of 10% and a side friction factor is 0.09; Minimum length of crest vertical curves if both tangents radius is ± maximum desirable grade, and Minimum length of sag vertical curves, for the maximum grade.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Appendix 1 - Question 4
Type of
terrain
Level
Rolling
Mountainous
Type of
terrain
0 to 400
60
50
30
Level
Rolling
where:
5
6
Mountainous 8 7
5
4
6 5
7
L =
A =
V =
Metric
Design speed (km/h) for
specified design volume (veh/day)
400 to
2000
4
5
6
L=
over 2000
80
100
60
80
50
60
Note: Where practical, design speeds higher than those shown should be considered.
length of sag vertical curve, m;
algebraic difference in grades,
percent;
design speed, km/h
3
4
6
Metric
Maximum grade (%) for
specified design speed (km/h)
60 70 80 90 100 110 120 130 40
5
4 4 6
5
8
AV2
395
Table 3
3
4
5
Table 4
3 3
ID W
5
US Customary
Design speed (mph) for
specified design volume (veh/day)
400 to
2000
50
40
30
Table 5
0 to 400
40
30
20
US Customary
Maximum grade (%) for
specified design speed (mph)
45 50
55 60 65 70 75
556
7
5457
4
5
6
over 2000
60
50
40
3
4
6
3 3
4
4
5
5
3
4
5
80
3
4
5
Transcribed Image Text:4.
(a) A rural collector in rolling terrain of St Vincent is to be designed in the year 2023 to carry a daily hourly
vehicle of 120 veh/hr with 95 % passenger cars. With the aid of the Tables provided in Appendix 1, and
using metric units, determine:
A suitable design speed;
Maximum desirable grade;
Minimum radius of horizontal curvature if given a super elevation of 10% and a side
friction factor is 0.09;
Minimum length of crest vertical curves if both tangents radius is ± maximum desirable
grade, and
Minimum length of sag vertical curves, for the maximum grade.
i.
ii.
iii.
iv.
V.
(b) In quality Control and Assurance testing, statistical methods are used to interpret the results of test on a small
sample to reach a conclusion concerning the acceptability of an entire lot or batch of materials or work
products. Name the two most common sampling methods used in pavement engineering testing and list the
differences between the two.
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