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15-22 Determine the di section with a normal crown cross-slope of 2 percent to superelevation of...
Question 5 (20 marks) A two-lane highway (one 3.6-m lane in each direction) goes from normal...
Question 5 (20 marks) A two-lane highway (one 3.6-m lane in each direction) goes from normal crown with 2% cross- slope to 6% superelevation by means of a spiral transition curve. The spiral curve is 60 m long. If the superelevation is attained by rotating the road section around its centreline, draw a cross section of the road at 10, 20 and 50 m from TS. (horizontal distances, grades, and elevated heights must all be labelled in the drawing)
(2 points) A horizontal curve on a two-lane highway (12-ft lanes) is designed for 55 mi/h...
(2 points) A horizontal curve on a two-lane highway (12-ft lanes) is designed for 55 mi/h with a 6% superelevation. The central angle of the curve is 50 degrees and the PI is at station 212+67. What is the station of the PT? Determine the length of superelevation runoff and tangent runout for the associated curve transition section (assume a normal, 2% crown). Assume perception-reaction time of 2.5 sec and the deceleration rate for braking (a) is 11.2 ft/sec2
Information (A horizontal curve connects two tangents that deflect at an angle of 45o on a...
Information (A horizontal curve connects two tangents that deflect at an angle of 45o on a two lane rural collector highway. The point of intersection of the tangents is located at station (658 + 16.13). If the design speed of the highway is 70 km/h and max. allowable superelevation rate is used. ) the question is (For the information given in question 2 above, and if the highway enters an urban area, and the normal crown cross section is to...
highway geometric Q1) A. What are the Principal elements of the highway cross section? Draw the...
highway geometric
Q1) A. What are the Principal elements of the highway cross section? Draw the typical cross sections for a two-lane highway. (5 Points) B. Briefly discuss the various indirect design factors to be considered for geometric design of highway. (10 Points) Q2) A. What is Road Alignment? Briefly describe the requirements of an ideal alignment. (5 Points) B. An equal-tangent sag vertical curve has the initial grade is -3.2% and the final grade is +1.8%, PVI at 30+30...
1)A horizontal curve connects two tangents that deflect at an angle of 45o on a two...
1)A horizontal curve connects two tangents that deflect at an angle of 45o on a two lane rural collector highway. The point of intersection of the tangents is located at station (658 + 16.13). If the design speed of the highway is 70 km/h and max. allowable superelevation rate is used. Determine the length of curve, degree of curve, point of curvature, point of tangency, and the ordinates. 2)For the information given in question 1above, and if the highway enters...
tme Ens EXAMPLE 3 On a highway, horizontal curve radius is 400m, design speed is 70 km/h, platform width is 10m and normal crown is 2%. Superelevation will be applied this curve without transit...
tme Ens EXAMPLE 3 On a highway, horizontal curve radius is 400m, design speed is 70 km/h, platform width is 10m and normal crown is 2%. Superelevation will be applied this curve without transition curve and widening . Calculate superelevation that will be applied on this curve . Calculate superelevation application length . Draw inside and outside edge elevation change with respect to inside edge line (schematic superelevation profile
tme Ens EXAMPLE 3 On a highway, horizontal curve radius is...
Determine the sight distance leg along the railroad tracks in ft. A two lane road crosses...
Determine the sight distance leg along the railroad tracks in
ft.
A two lane road crosses an at grade railroad track at 90°. If the design speed of the two lane road is 50 mi/h and the velocity of the train when crossing the highway is 90 mi/h, determine the sight distance leg (in ft) along the railroad tracks to permit a vehicle traveling at the design speed to safely cross the tracks when a train is observed at a...
Problem 1 (15vpts) A proposed highway has two tangents of bearings N 75° 54' 36" E...
Problem 1 (15vpts) A proposed highway has two tangents of bearings N 75° 54' 36" E and N 53° 22' 30" W. The highway design engineer, attempting to obtain the best fit for the simple circular curve to join these tangents, decides that the external ordinate is to be 78.00 ft. The Pl is at station 65+43.21. Determine: (a) The external angle of the curve (A) (b) The radius of the curve (d) The station of the PC (f) The...
Problem #2 A section of a six-lane highway (3 in each direction) with a two-way-left-turn lane...
Problem #2 A section of a six-lane highway (3 in each direction) with a two-way-left-turn lane (TWLTL) is being designed. Determine the level of service if the following data are applicable to this section. Traffic Data: • • • Directional design hour volume = 3600 veh/h (all are passenger cars) Peak-Hour-Factor (PHF) = 0.94 Base Free-Flow-Speed (FFS) = 55 mi/h Geometric data: • • • • • Urban setting Rolling terrain Lane width = 11 ft Shoulder width = 4...
2. A simple circular curve on a rural roadway is designed with a radius of 1500...
2. A simple circular curve on a rural roadway is designed with a radius of 1500 ft and a design speed of 55 mph. No spiral transition curve is to be used. The emax standard is 10%. The road has one lane per direction with 12-ft lanes and a 1% normal crown. (1.5 pts) a. Determine the design superelevation value (ed) and the corresponding lengths of superelevaion runoff (Lr) and tangent runout (Lt) (1.5 pts) b. Do a free-hand elevation...
Question 5 (20 marks) A two-lane highway (one 3.6-m lane in each direction) goes from normal crown with 2% cross- slope to 6% superelevation by means of a spiral transition curve. The spiral curve is 60 m long. If the superelevation is attained by rotating the road section around its centreline, draw a cross section of the road at 10, 20 and 50 m from TS. (horizontal distances, grades, and elevated heights must all be labelled in the drawing)
(2 points) A horizontal curve on a two-lane highway (12-ft lanes) is designed for 55 mi/h with a 6% superelevation. The central angle of the curve is 50 degrees and the PI is at station 212+67. What is the station of the PT? Determine the length of superelevation runoff and tangent runout for the associated curve transition section (assume a normal, 2% crown). Assume perception-reaction time of 2.5 sec and the deceleration rate for braking (a) is 11.2 ft/sec2
highway geometric
Q1) A. What are the Principal elements of the highway cross section? Draw the typical cross sections for a two-lane highway. (5 Points) B. Briefly discuss the various indirect design factors to be considered for geometric design of highway. (10 Points) Q2) A. What is Road Alignment? Briefly describe the requirements of an ideal alignment. (5 Points) B. An equal-tangent sag vertical curve has the initial grade is -3.2% and the final grade is +1.8%, PVI at 30+30...
tme Ens EXAMPLE 3 On a highway, horizontal curve radius is 400m, design speed is 70 km/h, platform width is 10m and normal crown is 2%. Superelevation will be applied this curve without transition curve and widening . Calculate superelevation that will be applied on this curve . Calculate superelevation application length . Draw inside and outside edge elevation change with respect to inside edge line (schematic superelevation profile
tme Ens EXAMPLE 3 On a highway, horizontal curve radius is...
Determine the sight distance leg along the railroad tracks in
ft.
A two lane road crosses an at grade railroad track at 90°. If the design speed of the two lane road is 50 mi/h and the velocity of the train when crossing the highway is 90 mi/h, determine the sight distance leg (in ft) along the railroad tracks to permit a vehicle traveling at the design speed to safely cross the tracks when a train is observed at a...
Problem 1 (15vpts) A proposed highway has two tangents of bearings N 75° 54' 36" E and N 53° 22' 30" W. The highway design engineer, attempting to obtain the best fit for the simple circular curve to join these tangents, decides that the external ordinate is to be 78.00 ft. The Pl is at station 65+43.21. Determine: (a) The external angle of the curve (A) (b) The radius of the curve (d) The station of the PC (f) The...
Problem #2 A section of a six-lane highway (3 in each direction) with a two-way-left-turn lane (TWLTL) is being designed. Determine the level of service if the following data are applicable to this section. Traffic Data: • • • Directional design hour volume = 3600 veh/h (all are passenger cars) Peak-Hour-Factor (PHF) = 0.94 Base Free-Flow-Speed (FFS) = 55 mi/h Geometric data: • • • • • Urban setting Rolling terrain Lane width = 11 ft Shoulder width = 4...
2. A simple circular curve on a rural roadway is designed with a radius of 1500 ft and a design speed of 55 mph. No spiral transition curve is to be used. The emax standard is 10%. The road has one lane per direction with 12-ft lanes and a 1% normal crown. (1.5 pts) a. Determine the design superelevation value (ed) and the corresponding lengths of superelevaion runoff (Lr) and tangent runout (Lt) (1.5 pts) b. Do a free-hand elevation...
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