I've skimmed through some Singapore's road guidelines and driver's handbook and didn't find any particular significance of kerb paining, from the context I inferred that striped kerb is painted that way just to be visually distinct, to be noticeable. Significant markings are made on the road alongside the kerb, like those two yellow stripes mean "no parking at all times".

Nah, there's no Lava demon, they are just preparing for the life in Phoenix, AZ where the pavement melts off your soles.