a) The 'e' value of a crest curve is found to be greater than the eye...

 

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a) The 'e' value of a crest curve is found to be greater than the eye height of the driver above the road surface. Determine the minimum length of the curve, if a hazard is assumed to be at the level of the carriageway. (CR,10) b) A consultant undertook the vertical alignment design of a highway section using the standards specified in the table below. Review the adequacy of the design with regards to the Ghana Highway Authority Road Design Guide and make recommendations where appropriate. (AN,10) Design criteria Design speed Minimum curve radius Minimum curve length Maximum standard gradient Minimum standard gradient Maximum combined gradient Adopted standard 80km/h 1800m i. ii. iii. iv. V. 68m 3% 0.5% 11.5% c) Classify the following into the various types of vertical curves (EV,5) G₁ = +2 %, G₂ = +3% G₁ = +3%, G₂ = +2% G₁-3%, G₂ = -4% G₁-3%, G₂ = -2% G₁-3.5 %, G₂ = +3.5 % Where 'Gi' is the entry gradient and 'G₂' is the exit gradient. a) The 'e' value of a crest curve is found to be greater than the eye height of the driver above the road surface. Determine the minimum length of the curve, if a hazard is assumed to be at the level of the carriageway. (CR,10) b) A consultant undertook the vertical alignment design of a highway section using the standards specified in the table below. Review the adequacy of the design with regards to the Ghana Highway Authority Road Design Guide and make recommendations where appropriate. (AN,10) Design criteria Design speed Minimum curve radius Minimum curve length Maximum standard gradient Minimum standard gradient Maximum combined gradient Adopted standard 80km/h 1800m i. ii. iii. iv. V. 68m 3% 0.5% 11.5% c) Classify the following into the various types of vertical curves (EV,5) G₁ = +2 %, G₂ = +3% G₁ = +3%, G₂ = +2% G₁-3%, G₂ = -4% G₁-3%, G₂ = -2% G₁-3.5 %, G₂ = +3.5 % Where 'Gi' is the entry gradient and 'G₂' is the exit gradient.