In general, kerbs are essential in road pavements due to the following reasons (based on Arthur Wignall, Peter S. Kendrick and Roy Ancil):
(i) They provide strength to the sides of road pavements and avoid lateral displacement of carriageway due to traffic loads.
(ii) In terms of road safety, they serve as a separation line between footway and carriageway and aid car drivers in driving safely.
(iii) They act as a vertical barrier to guide the surface runoff collected in road pavements to the gullies.
This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.