Section 4

Any regulations made under section 3 are, unless the contrary is expressly stated, deemed to be additional to, and not in substitution for, the provisions of any other written law for the time being in force.

To avoid doubt, it is declared that the taking into or out of Singapore of any ship, aircraft or vehicle may be prohibited or regulated by any regulations made under section 3 as an importation or exportation of goods, even though the ship, aircraft or vehicle is conveying goods or passengers, and whether or not it is moving under its own power.