Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
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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Chapter 15 Solutions
Traffic and Highway Engineering
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- (b) For the safe road design and smooth traffic flow, combination of transition and circular curve will be constructed to combine two tangent line that have bearing of N 70° E (entry tangent) and S 80° E (exit tangent) respectively. With the aid of sketch, design the minimum length of transition curve and circular curve that has the following characteristics • Design speed = 110 km/hr coefficient of side friction, f= 0.15 Superelevation, e = 5 % • Radial acceleration, c = 0.9 m/s³arrow_forwardc. 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 kpharrow_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
- The 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_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_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_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_forwardFor the following conditions: Design speed 60 mph, V/C ratio = 0.6, Level of service = Curve radius, 955 ft, Time value = $4/hr. If the basic section cost for passenger cars on a multilane highway is $206/KV-M, estimate the highway grade. B, %3Darrow_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
- An equal tangent vertical curve is intended to connect grades of 1.9% and -1.9%. If this curve is to be a part of a highway designed with a PSD of 500ft, determine the minimum length (ft) of the vertical curve. Use exact solution (do not use the table). Round your answer to 3 decimal places. Add your answerarrow_forwardTraffic Engineering vertical curve problem. Solve the d,e,f partarrow_forwardThe data given for a vertical sag curve on a roadway plan and profile sheet are as follows: PVI station @ 32+11.61, PVI elevation =54.18 ft, back tangent gradient g1 =- 4.00 percent, forward tangent gradient g2 = + 7.00 percent, and length of curve L= 600ft. Determine the curve elevations at half-station intervals along the curve, and compute the station and elevation of the lowest point.arrow_forward
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