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The proposed roadway has the following specifications:
1) rural road
2) design speed = 50 kph
3) radius of curvature = 192m;
4) 3-lane two-way direction
5) use maximum superelevation, emax= 8%
Calculate the superelevation rate and coefficient of friction to be implemented in the road design.
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Solved in 2 steps with 2 images
- Please solve this question in step by step in hand- It is transportation-2 Civil engineering Question-1 Determine the maximum degree of curvature of a highway that has a design speed of 120 Km/hr., a maximum superelevation rate of 8% (i.e. ema- 8%). Assume a suitable friction coefficient value. Also, for the same highway, determine the superelevation for a curve having a degree of curvature of 2 degrees.Wrong answer will be rated negative. The horizontal distance between its PVI and PVC is 150 meter. The elevation of PVI is 450.2 meter. The initial and final grades of the road are -4% and +3% respectively. Chainage of PVC is 1620 m. Based on the given set of information, determine the followings: i. Elevation of PVC. ii. The chainage of PVI. iii. Chainage and elevation of PVT. iv. Chainage and elevation of the lowest point of the sag curve.Determine the total thickness of flexible pavement (in mm) for a two Lane undivided carriageway using the following data:
- Estimate the horsepower required to accelerate a 2,500-lb vehicle traveling 30 mph up a 5% grade at the rate of 6 ft/sec². The vehicle has a frontal cross-sectional area of 20 ft2. The roadway has a straight alignment and a badly broken and patched asphalt surface Assume the drag coefficient = 0.3 and a rolling resistance =34 Use the following: (a) Inertia resistance, F, =? (compute) (b) Grade resistance, F =? (compute) (c) Rolling resistance, F, = 34 lb (d) Curve resistance, F = 0 (e) Air resistance; Use the formula :F= 0.0006AV² (f) HorsepowerDesign a highway with the following criteria (Determine the minimum radius, widening and check if it needs transition spiral) Design speed = 85 kph I = 20o e = 0.06 sight distance = 125m m = 10 m 2 lane road Typical car wheel length 2.5 m Width of pavement per lane = 3.6 mWhat is the K- design value for a roadway designed for 70 mph, and G₁--2.5% and G2=3.9%?
- A northbound direction on an interstate highway consists of three lanes of flexible pavement. The subgrade CBR is 4.5, the overall standard deviation is 0.38, and the reliability is 95%. The initial PSI is 4.5 and the final PSI is 2.5. Daily total northbound road traffic consists of 39,500 cars (each with two 2kip single axles), 775 buses ((each with two 19 kip single axles) and 1100 heavy trucks (each with two 10kip single axle and two 34kip tandem axles). If the pavement is designed to last for 20 years, what should be its structural number?• Question 17 The minimum radius of the curve is 216 meters, and the value of coefficient of friction and superelevation combined is equal to 0.8. What should be the maximum design vehicle speed at the curve in order for road users to safely traverse it? • Question 18 Calculate the design thickness in mm (rounded to the nearest tens) at the edge of a rigid pavement with dowels if the: Allowable tensile strength of concrete = 3.0 MPa Wheel load = 117 kNQ2- Calculate the right of way of rural divided four-lane highway has a depressed median and it is constructed on embankment. The median width is 40 m. embankment height is 6m. lane width is 3.5 m.shoulder width is 2.5 m and side slope is 1:3 (VH)?
- A new transportation engineer is charged with the design of a horizontal curve a certain highway. His final design calls for a curve with a radius of 520 meters. Assume that the design speed for the highway is 110 km/h. Is the design curve acceptable? Consider super elevation of 8% and a maximum side friction factor of 0.1.The braking distance of a car from 90 km/h is 40 m assuming the pavement is level. (a) if the pavement is with 5° inclination, what will be the braking distance (in meter) of the car going up from 90km/h? (b) and if the car is going down at 6% inclination, what is its braking distance (in meter) from 90km/h? Note: Assume the breaking force is not dependent of the grade. Select the correct response(s): O 42.71 O 45.78 O 52.34 O 43.25 O 54.12 O 46.77 O 34.30 O 36.05 O 44.13 O 40.95 O 41.96 O 50.90 O O O O O O O O Osection of a two-lane rural highway is to be realigned and replaced by a four-lane highway with a full-depth asphalt pavement. Consists of 40% trucks. If classification studies have shown that the truck factor can be taken as 0.45, design a suitable flexible pavement using the 1993 AASHTO procedure if the AADT on the design lane during the first year of operation is 1000. It is expected that construction will be completed five years from now, and pi =4.5 and pt = 2.5. Growth rate = 4%. Design life = 20 years. The pavement structure will be exposed to moisture levels approaching saturation 20% of the time, and it will take about one week for drainage of water. Effective CBR of the subgrade material is 7. CBR of the base and subbase are 70 (Mr=30000 lb/in2 ) and 22 (Mr=13500 lb/in2 ), respectively, and Mr for the asphalt mixture, 400,000 lb/in2 .