When operating a high-cube van truck or double-deck commercial vehicle transporter with a high center of gravity (高重心), what is the safest driving strategy when entering an expressway interchange ramp?

1. Reduce speed well before the ramp entrance curve, maintain a smooth steady arc, and avoid abrupt steering or braking
2. Maintain highway cruising speed until reaching the curve apex, then apply emergency braking
3. Coast through the curve in neutral to allow the high center of gravity to self-stabilize
4. Accelerate sharply through the curve to generate downward aerodynamic downforce