Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 15, Problem 5P
To determine
Using the minimum length based on SSD criteria find the minimum length of a crest vertical curve and assumptions used.
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Determine the minimum length of a sag vertical curve if the grades are -3.5% and +3%. Design
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Determine the minimum lenght of a crest vertical curve if the grades are +4% and -2%. Design speed is 112km/h. State assumptions used in solving this problem.
Determine the minimum length of a sag vertical curve if the grades are 4% and 2%. Design speed is 70 mi/h. State assumptions used. Consider the following criteria: (a) Stopping sight distance (b) Comfort (c) General appearance
Chapter 15 Solutions
Traffic and Highway Engineering
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- Determine the minimum length (Lmin) of a curve above if the slopes are + 3% and -3%, with a design speed of 75mi / hr, state the assumptions used to solve this problem.arrow_forwardDetermine the minimum length of a crest vertical curve if the grades are +4% and 2%. Design speed is 70 mi/h. State assumptions used in solving this problem.arrow_forward1. A crest vertical curve connects a +1.5 % grade with a -2.5 % grade on a two-lane highway. The criterion selected for design is the minimum stopping sight distance for a design speed of 90 km/h based on AASHTO (2004) design criteria. If the grades intersect at station (14+465) at an elevation of 100 m, compute the station and elevation of BVC, EVC, and highest point. Also, compute the elevation of the curve at 50-m intervals. Display all results in a tabular form.arrow_forward
- -Determine the minimum length of a highway sag curve (based on SSD Criterion) that is designed to join a - 0.035 grade to a + 0.025 grade, if the design speed is 90 km/h. Assume a = 3.4 m/s2, t = 2.5 s. Untitled Questionarrow_forwardDetermine the minimum length of a crest vertical curve if the grades are +4.0 % and -4.00 %. Design speed is 70 mph. State assumptions used in solving this problem.arrow_forward1. A+4.5% grade on rural free way intersects with a-2.5% grade at chainage of 67+500 at an elevation 75.00. If the design speed of free way us 100km/hr. N.b obtain the value of (k) from the following table # determine the chainage and elevation of the Bvc, Evc and the lowest point #if the road is stacked at 50m interval, calculate the elevations of all full chainage a long the curve. Table. minimum value of k for vertical curve. Design speed crest value sag value 40 6 8 50 11 12 60 16 16 70 23 20 80 33 25 90 46 31 100 60 36 110 81 43 120 110 52 130 133 57arrow_forward
- Determine the minimum length (ft) for a vertical curve with 55mph design speed if the grades to be connected are 1.72% and -1.77%. Use the table provided by AASHTO.arrow_forwardDetermine the minimum length of a vertical curve with an initial grade of +2.5% and an ending grade of -2%. The design speed is 35 mi/h.arrow_forwardQ 1: Determine the minimum length of a highway sag curve (based on SSD Criterion) that is designed to join a - 0.035 grade to a + O.025 grade, if the design speed is 90 km/h. Assume a = 3.4 m/s2, t = 2.5 s.arrow_forward
- A +4.0% grade intersects a -3.0% percent grade at PVI Sta. 222+00 and Elevation 300.00 on a two-lane highway with a design speed of 45 mph. Assume AASHTO Standards. 1. Determine the minimum length for the curve that is designed to meet passing sight distance using K-value method 2. Determine the Station and Elevation of the PVCarrow_forwardThe arterial road with a 100 km/h design speed will be constructed on the flat terrain. At one section, the equal tangent vertical curve as shown in Table 3 is proposed. Table 3: Parameters of Vertical Alignment Length 490 m PVC station 3+700.000 PVC elevation 460 m Initial grade -3.5% Final grade 6.5% (a) Calculate the stationing and elevation of the low point, PVI and PVT. (b) Calculate the minimum length of curve to meet stopping sight distance requirementsarrow_forwardDetermine the minimum lenght of sag vertical curve if the grades are -4% and +2%. Design speed is 112 km/h. Consider the following criteria; a) stopping sight distance, b)comfort, c)general appearancearrow_forward
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