Consider the statements regarding vertical curves:
(a) Square parabola is the best shape of summit curve due to good riding qualities, simplicity of calculation and uniform rate of change of grade.
(b) Ideal shape of summit curve is circular because sight distance available throughout the curve is variable.
Choose the correct statement.
1
Only (a)
2
Only (b)
3
Both (a) and (b)
4
Neither (a) nor (b)