ASSIGNMENT NO 2
1- A two lane highway goes from normal crown of 2.5% to 10 % SE by means of a spiral
curve. Determine minimum length of spiral if difference in grade between center line
edges of the road is limited to 'l/200. Draw SE diagram taking Stations of TS as 160+00.
Width of one lane is 3.5 m.
2- Same as problem -1 except that SE is' 7.5% and Station of TS is 80+00.
3- A 2 lane highway with design speed of 100 km/h has a 400 m radius. Horizontal curve
connects tangents with bearings of N 75 E and S 78 E, determine SE rate and length of
Spiral, if difference in grade between center line and edge of the road is limited to 1/200
also sketch SE diagram take Stn. of TS as 100+00. Rotation at the inner edge of the
pavement
4- For a SE of 0.08 compute minimum possible radii of curves for a road of 30, 40, 50, 60,
70 km/h.
5- Vehicle performance is being tested on a large flat paved area. For this situation,
What coefficient of side friction must be developed to hold a car going 60 miles/h
on a 1000 ft radius curve.
What minimum radius of curve is required for a vehicle traveling at 60 miles/h if
co-efficient of side friction is 0.40?
6- An existing horizontal curve on a highway has a radius of 268 ft which restricts the
maximum speed on this section of the road to only 60% of the design speed of highway.
If curve is to be improved so that its maximum speed will be the design speed of highway
determine radius of the new curve. Assume f = 0.15 for the existing curve and e = 0.08
for both the existing and new curve to be designed.
7- Determine min. radius required at a curved Section of highway if design speed is 70
miles/h and SE = 0.08
8- Curve is to be designed for highway having design speed 60 miles/h. If physical conditions
restrict the radius of curve to be 500 ft, what SE is required for this curve? Will this be a
good design?
9- Radius of horizontal curve on an existing highway is 750 m. If SE = 0.08 and max. speed
limit is 105 km/h, is this a hazardous location on highway? If so what action would you
recommend to correct the situation?
10- Radius of horizontal curve on an existing highway is 750 ft. If SE = 0.08 and max. speed
limit is 100 km/h, is this a hazardous location on highway? If so what action would you
recommend to correct the situation?
10- A section of highway has e = 0.05 and curve with a radius of 300 ft what speed limit
would you recommend at this section of highway, take f = 0.15.
11- A new highway is being built with a design speed 120 km/h for one of the horizontal
curves radius of horizontal curve is being planned as 300 m. What “e” is required for
this curve?
12- Determine proper SE rate for a gravel road with a design speed of 50 miles/h, and D = 8°.
13- Find max degree “D” of a horizontal curve for a roadway. Given: V = 65 m.p.h. f and e,
are in the range of 0.1 to 0.15 and 0.08 to 0.1.
14- A l two lane highway has 6° horizontal curve what should be e to develop maximum
permissible side friction on this section at V = 65 m.p.h.. Schematically show the
method of attaining SE by revolving pavement about outside edge, take f = 0.11.
