A two-lane highway is being expanded to four lanes with the original highway consisting of the northbound lanes and the new highway carrying the southbound lanes. At one location, the southbound facility crosses over an existing pipeline. The resulting vertical curve needs to be at least 10 feet above the top of the pipeline. The initial grade is -4 and G2 is +2. The design speed for the new highway is 60 mi/hr. (1) Is the length of the design curve greater or less than the required stopping distance? (2) The PVI is at station 425+74 and the elevation is 980 ft. If the pipeline is at station 424+54 and the elevation of the top of the pipeline is 985 ft, is the distance from the curve to the top of pipeline adequate to meet the 10 feet required cover? I recommend drawing the cross-section of the curve including the location of the pipeline when answering this question. Note that instead of clearance from the curve up to the the bottom of the overpass (example in the book), this is clearance from the curve down to the top of the pipe.
A two-lane highway is being expanded to four lanes with the original highway consisting of the northbound lanes and the new highway carrying the southbound lanes. At one location, the southbound facility crosses over an existing pipeline. The resulting vertical curve needs to be at least 10 feet above the top of the pipeline. The initial grade is -4 and G2 is +2. The design speed for the new highway is 60 mi/hr. (1) Is the length of the design curve greater or less than the required stopping distance? (2) The PVI is at station 425+74 and the elevation is 980 ft. If the pipeline is at station 424+54 and the elevation of the top of the pipeline is 985 ft, is the distance from the curve to the top of pipeline adequate to meet the 10 feet required cover? I recommend drawing the cross-section of the curve including the location of the pipeline when answering this question. Note that instead of clearance from the curve up to the the bottom of the overpass (example in the book), this is clearance from the curve down to the top of the pipe.
Traffic and Highway Engineering
5th Edition
ISBN:9781305156241
Author:Garber, Nicholas J.
Publisher:Garber, Nicholas J.
Chapter9: Capacity And Level Of Service For Highway Segments
Section: Chapter Questions
Problem 8P
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Transcribed Image Text:A two-lane highway is being expanded to four lanes with the
original highway consisting of the northbound lanes and the
new highway carrying the southbound lanes. At one location,
the southbound facility crosses over an existing pipeline. The
resulting vertical curve needs to be at least 10 feet above the
top of the pipeline. The initial grade is -4 and G2 is +2. The
design speed for the new highway is 60 mi/hr.
(1) Is the length of the design curve greater or less than the
required stopping distance?
(2) The PVI is at station 425+74 and the elevation is 980 ft. If
the pipeline is at station 424+54 and the elevation of the top
of the pipeline is 985 ft, is the distance from the curve to the
top of pipeline adequate to meet the 10 feet required cover?
I recommend drawing the cross-section of the curve including
the location of the pipeline when answering this question.
Note that instead of clearance from the curve up to the the bottom
of the overpass (example in the book), this is clearance from the
curve down to the top of the pipe.
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