SINGAPORE - If you are planning to drive to Malaysia for the upcoming long weekend, plan for heavy traffic.

The Immigration & Checkpoints Authority (ICA) issued an advisory to warn travellers to expect delays at the Woodlands and Tuas checkpoints.

Traffic leaving Singapore will be especially heavy on May 29 and May 30. Traffic entering Singapore will be heavy on June 1.

The ICA said that with security checks, traffic build-up is inevitable and urged travellers to adjust travel plans.

The ICA had tips for travellers who are using the checkpoints over the long holiday weekend:

* Car-pool where possible.

* Drivers should maintain lane discipline at all times to facilitate the smooth flow of traffic.

* Singaporeans, Singapore Permanent Residents and Long Term Pass holders should use the enhanced Immigration Automated Clearance System (eIACS) lanes at the bus halls for immigration clearance.

* Travellers should ensure their passports are valid for immigration clearance.

* Travellers cannot bring unlawful or prohibited goods into or out of Singapore. The list of controlled and prohibited items can be found on ICA's website http://www.ica.gov.sg.

Before setting off on your journey, check the traffic situation at both land checkpoints. You can call the traffic hotline on 6863-0117, or go to the Land Transport Authority's One Motoring website (www.onemotoring.com.sg) or MyTransport.SG portal (www.mytransport.sg) for traffic updates.