Security checks on arriving travellers, cargo and conveyances have been stepped up at all checkpoints in view of the heightened global security situation.  SINGAPORE: Very heavy traffic is expected at the Woodlands and Tuas checkpoints during the Good Friday long weekend this week, said the Immigration and Checkpoints Authority (ICA) on Monday (Mar 30). Running from Apr 3 to Apr 5, the long weekend also coincides with the Qing Ming period. Security checks on arriving travellers, cargo and