a) The Conventional Ground Survey and Remote Sensing are two techniques employed for conducting highway location surveys,
Question:
a) The Conventional Ground Survey and Remote Sensing are two techniques employed for conducting highway location surveys, as a Highway Engineer,
i. establish the key differences between the application of the two techniques at the first three stages of the highway location process.
EV(8)
ii. which survey technique will be more suitable for locating a route between Accra and Kumasi assuming there is no existing road and why? (Note: requisite logistics are available for the application of the two methods) EV(2)
b) Would the geometric design standards of an arterial road be the same as a Collector Road? Give reasons for your answer. (AP,5)
c) Identify the key design controls and criteria used to specify the following geometric design parameters for roads in Ghana
i. Design speed
ii. Maximum gradient
iii. Minimum vertical curve length
iv. Minimum vertical curve radius
v. Minimum stopping sight distance
b) Identify the functional classes of roads with respect to the following road agencies in Ghana (CR,9)
i) Ghana Highway Authority
ii) Department of Urban Roads
iii) Department of Feeder Roads
c. As the Municipal Engineer of Ga South Municipal Assembly, how would you improve the sight distances at the various intersections within the
municipality? (AP,6)
Question 4
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 and the driver has an average eye height from the road surface. (CR,10)
b) The figures below present two scenarios of an intersection layout with vehicle ‘A’ on the minor road and vehicle ‘B’ on the major road with a building (shaded) at one corner of the intersection. Vehicle ‘A’ in its quest to cross the intersection must look for an appropriate gap based on the intersection sight distance to be able to cross safely without colliding with vehicle ‘B’.
i. Compare the intersection sight distance provision of the two scenarios AN(3)
ii. What accounted for the results in (i) above? AN(5)
iii. How would you improve the intersection sight distance irrespective of the scenario? AN(2)
Scenario 1 Scenario 2
Note: The drawings are of the same scale
c) A consultant was tasked to undertake the design of the Atta Mills road which is a collector road connecting Old Barrier along the Accra-Winneba road to Aplaku. A design speed of 65km/h was used for the geometric design of the road. However, after the construction of the road, the Department of Urban Roads (DUR) posted a speed limit of 50km/h. Comparing the two peed values, do you think DUR did the right thing and why? (CR,5)
