Traffic And Highway Engineering
5th Edition
ISBN: 9781133605157
Author: Garber, Nicholas J., Hoel, Lester A.
Publisher: Cengage Learning,
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Chapter 15, Problem 19P
To determine
(a)
The minimum radius of horizontal curvature for given conditions.
To determine
(b)
The minimum length of crest vertical curves.
To determine
(c)
The minimum length of sag vertical curves.
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A grade of vertical curve can
expressed as
be
O O O O O
O A-In terms of percent
O D-Both A and B
C-In terms of number
B-In terms of ratio
O E-None of above
Solve quick
c. The length of the first curve in yard if the total length of the roadway is 745
m given that the second curve has a design speed of 70 kph for passing sight
distance with the driver's eye height assumed to be 1.5 mand object height
of 0.33 m
d. The total length of the roadway in km if a bridge structure were to be
located within the first curve, with a required clearance height of 6.25 m,
then assuming a driver's eye height of 3.4 m and an object height of 0.31 m
if the design speed is 130 kph
Chapter 15 Solutions
Traffic And Highway Engineering
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- Only do question 3arrow_forwardA rising grade of 1.5 percent meets a falling grade of 4.0 percent at station 2+400 of elevation 15.0 m. Design the vertical curve connecting the two tangent grades to conform with the following safe stopping sight distance specifications. • Design velocity = 40 mph • Height of an object over the pavement ahead = 0.11 m • Height of driver's eye from the road pavement = 1375 mm • Response-initiation time = 1.5 sec • Coefficient of friction between the road pavement and the tires = 0.10 14. Determine the stopping sight distance. a. 133.333 m b. 140.667 m c. 168.475 m d. 170.555 m 15. Determine the length of curve. a. 344.948 m b. 422.757 m c. 279.001 m d. 360.667 m 16. Determine the elevation of highest point on curve. a. 13.119 m b. 12.005 m c. 14.322 m d. 11.333 marrow_forwardA proposed vertical alignment includes a +2% gradient followed by a -3% gradient. Assuming a design speed of 110km/hr, a truck driver eye height of 2.4m, a passenger car driver eye height of 1.1m, and an object height of 0.2m, calculate the minimum vertical curve length required for the vertical curve to maintain a stopping sight distance of at least 208.716m throughout. Note: Your answer should be provided to ONE decimal place and in units of meters.arrow_forward
- 11. Two vertical parabolic curves have been connected to form a roadway by three gradients: -5.30 %, 4.10 % and -3.70 % respectively. If the length of the second curve is half the length of the first curve, compute the following: a. The length of the second curve in ft given that the design speed of the first curve is 80 kph assuming a vertical radial acceleration of 0.3m/s? for comfort criterion.arrow_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_forwardWhat is the minimum radius of a horizontal curve required for a highway if the design speed is 55 mph and the superelevation rate is 7%? Use AASHTO tablEarrow_forward
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