1- A two-lane highway (two 3.6 m lanes) has a posted speed limit of 100 km/h and, on one section, has both horizontal and vertical curves, as shown in the figure below. A recent daytime crash (driver traveling westbound and striking a stationary roadway object) resulted in a fatality and a lawsuit alleging that the 100 km/h posted speed limit is an unsafe speed for the curves in question and was a major cause of the crash. Evaluate and comment on the roadway design (after Mannering and Washburn). Plan view (horizontal alignment) PC Station 4+90 Profile view (vertical alignment) e = 8.0% 100 m Sight obstruction 50° G₁ = -2.0% PVC Station 4+30 T PVI PVT Station 6+80 PT N Station 10+00 G₂ = +4.0%

Traffic and Highway Engineering
5th Edition
ISBN:9781305156241
Author:Garber, Nicholas J.
Publisher:Garber, Nicholas J.
Chapter7: Intersection Design
Section: Chapter Questions
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1- A two-lane highway (two 3.6 m lanes) has a posted speed limit of 100 km/h and, on
one section, has both horizontal and vertical curves, as shown in the figure below. A
recent daytime crash (driver traveling westbound and striking a stationary roadway
object) resulted in a fatality and a lawsuit alleging that the 100 km/h posted speed
limit is an unsafe speed for the curves in question and was a major cause of the crash.
Evaluate and comment on the roadway design (after Mannering and Washburn).
Plan view (horizontal alignment)
PC
Station 4+90
Profile view (vertical alignment)
e = 8.0%
100 m
Sight
obstruction
50°
G₁ = -2.0%
PVC
Station 4+30
T
PVI
PVT
Station 6+80
PT
N
Station 10+00
G₂ = +4.0%
Transcribed Image Text:1- A two-lane highway (two 3.6 m lanes) has a posted speed limit of 100 km/h and, on one section, has both horizontal and vertical curves, as shown in the figure below. A recent daytime crash (driver traveling westbound and striking a stationary roadway object) resulted in a fatality and a lawsuit alleging that the 100 km/h posted speed limit is an unsafe speed for the curves in question and was a major cause of the crash. Evaluate and comment on the roadway design (after Mannering and Washburn). Plan view (horizontal alignment) PC Station 4+90 Profile view (vertical alignment) e = 8.0% 100 m Sight obstruction 50° G₁ = -2.0% PVC Station 4+30 T PVI PVT Station 6+80 PT N Station 10+00 G₂ = +4.0%
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