A +2.5% grade intersects with a –1.5% grade at station (53+524.25) at an elevation of 90 m. If the design speed is 90 km/h, use AASHTO (2011) criteria to determine: The minimum length of vertical curve using the rate of vertical curvature. The stations and elevations of the BVC and EVC. The elevation of each 20-m station. The station and elevation of the highpoint.
A +2.5% grade intersects with a –1.5% grade at station (53+524.25) at an elevation of 90 m. If the design speed is 90 km/h, use AASHTO (2011) criteria to determine: The minimum length of vertical curve using the rate of vertical curvature. The stations and elevations of the BVC and EVC. The elevation of each 20-m station. The station and elevation of the highpoint.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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- A +2.5% grade intersects with a –1.5% grade at station (53+524.25) at an elevation of 90 m.
If the design speed is 90 km/h, use AASHTO (2011) criteria to determine:
- The minimum length of vertical curve using the rate of vertical curvature.
- The stations and elevations of the BVC and EVC.
- The elevation of each 20-m station.
- The station and elevation of the highpoint.

Transcribed Image Text:Values of K for Crest Vertical Curves Based on Stopping Sight Distance
Rate of Vertical Curvature, Kª
Stopping Sight
Distance (ft)
Design Speed (mi/h)
Calculated
Design
15
80
3.0
3
20
115
6.1
7
25
30
35
155
200
250
11.1
18.5
29.0
12
19
29
40
45
305
360
43.1
60.1
83.7
113.5
44
61
50
425
55
60
495
570
84
114
151
150.6
65
70
645
730
820
192.8
246.9
193
247
75
311.6
312
80
910
383.7
384
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