The roads which are provided with a hard pavement course having at least a water bound macadam (WBM) layer are classified as
- APaved roadsCorrect
- BUnpaved roads
- CSurface roads
- DUnsurfaced roads
Solution
Concept
Roads with a hard pavement course of at least WBM are called paved roads.
Step-by-step solution
1. Roads can be grouped by the type of carriageway or pavement. 2. Paved roads have a hard pavement course that is at least a WBM layer. 3. Unpaved roads have no such hard course, for example earth roads and gravel roads. 4. So a road with at least a WBM layer is a paved road.
Explanation
Roads are grouped by their pavement as paved or unpaved, and as surfaced or unsurfaced. A road with a hard pavement course of at least WBM is a paved road. Surfaced roads are a narrower group that has a bituminous or cement concrete surface.
Why the other options are wrong
B: Unpaved roads (earth and gravel roads) have no hard WBM course. C: Surfaced roads need a bituminous or cement concrete surface, so plain WBM is not enough. D: Unsurfaced roads have no surfacing at all, which does not match this definition.
Shortcut
At least WBM = Paved. Bituminous or CC surface = Surfaced.
Common mistake
Mixing up paved roads (WBM is enough) with surfaced roads (need a bituminous or CC surface).
Correct answer: A) Paved roads