What does a circular white sign with a red border showing a red truck overtaking a black passenger car on the left mean (Znak II-33, 'Zabrana preticanja za teretna motorna vozila')?

1. Overtaking is strictly prohibited for freight motor vehicles with a maximum authorized mass exceeding 3,500 kg
2. Overtaking is prohibited for passenger cars only; trucks may overtake freely
3. Trucks must move to the left lane immediately
4. Trucks and cars must travel in parallel lanes at identical speed