Observation

Majority of candidates were able to:
-           state two functions of a road kerb;
-           state three factors that influences the choice of materials for pavement works.
However, few of the candidates were not able to:

• sketch in elevation a wooden close-boarded fence;
• label the parts of  a wooden close-boarded fence correctly.

The expected response to question 5 is as given below:

.(a)      Two functions of a road Kerb:
 
(i)         kerb resists the lateral thrust of the traffic on it;
(ii)        kerb is also used to guide traffic;
(iii)       kerb is used on dual carriageway to protect the pedestrians from vehicle;
(iv)      kerb defines carriageway limits;
(iv)      kerb directs the flow of surface water to gullies.

   b)          Three factors that influence the choice of materials for pavement works:

• material cost;
• maintenance cost;
• appearance;
• wear-resistance properties;
• strength/durability;
• weather resistance;
• non-slip properties.
• traffic volume;
• traffic characteristics.

  (c)      Sketch of a close-boarded wooden fence