Travellers should also expect longer waiting times to clear immigration due to stepped-up security checks on arriving travellers, cargo and vehicles, said the Immigration and Checkpoints Authority. SINGAPORE: Travellers crossing Singapore's land checkpoints during the March school holidays from Mar 13 to Mar 22, which coincides with the Hari Raya Puasa weekend, should expect very heavy traffic. Travellers should also expect longer waiting times to clear immigration due to stepped-up security