SINGAPORE: With the National Day long weekend approaching, the Immigration & Checkpoints Authority (ICA) has warned travellers to expect heavy traffic at the Woodlands and Tuas checkpoints from Friday through next Monday, urging those planning to cross the border to make their journeys in advance. The warning comes after several recent holiday periods saw exceptionally high numbers of travellers using the land checkpoints. Traffic reached a new high on June 19, when more than 598,000 travellers crossed the two checkpoints in a single day. During peak travel periods, motorists may face waits of up to three hours before clearing immigration, the authority said. With traffic volumes expected to surge again over the National Day long weekend, the ICA advised travellers to factor in additional waiting time and prepare for possible delays before setting off.