12. Refer to Figure II-1 attached. A flexible pavement is to be evaluated according to the AASHTO 1972  design guide. The existing pavement has a weighted structural number=3.4, a regional factor=2.0, and a  soil support value=4.5. What would be the approximated number of daily equivalent 18-kip axles to be  allowed on this road for a 20-year analysis period? a. 10 b. 33 c. 100 d. 1490

Traffic and Highway Engineering
5th Edition
ISBN:9781305156241
Author:Garber, Nicholas J.
Publisher:Garber, Nicholas J.
Chapter21: Pavement Management
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12. Refer to Figure II-1 attached. A flexible pavement is to be evaluated according to the AASHTO 1972 
design guide. The existing pavement has a weighted structural number=3.4, a regional factor=2.0, and a 
soil support value=4.5. What would be the approximated number of daily equivalent 18-kip axles to be 
allowed on this road for a 20-year analysis period?
a. 10
b. 33
c. 100
d. 1490

Figure II-1
Design Chart for Flexible Pavements, Pt - 2.5
SUPPORT VALUE
IT!!!
5 - SOIL
TOTAL EQUIVALENT 18-KIP SINGLE
AXLE LOAD APPLICATIONS, THOUSANDS
४४
-10
500
1,000
SN
-100
3,000
10,000
20,000 3,000
-2,000
-500
DAILY EQUIVALENT 18-KIP SINGLE
AXLE LOAD APPLICATIONS
(20 year analysis period)
-1,000
SN-WEIGHTED
STRUCTURAL NUMBER
REGIONAL FACTOR
STRUCTURAL NUMBER
Transcribed Image Text:Figure II-1 Design Chart for Flexible Pavements, Pt - 2.5 SUPPORT VALUE IT!!! 5 - SOIL TOTAL EQUIVALENT 18-KIP SINGLE AXLE LOAD APPLICATIONS, THOUSANDS ४४ -10 500 1,000 SN -100 3,000 10,000 20,000 3,000 -2,000 -500 DAILY EQUIVALENT 18-KIP SINGLE AXLE LOAD APPLICATIONS (20 year analysis period) -1,000 SN-WEIGHTED STRUCTURAL NUMBER REGIONAL FACTOR STRUCTURAL NUMBER
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