When a no stopping sign (433) is placed on the right side of a two-way highway:

1. Stopping is prohibited on both sides of the vehicle.
2. Correct answer: Stopping is prohibited on the right side of the roadway and on the hard shoulder.
3. Stopping is prohibited on the roadway only.
4. Stopping is prohibited on the hard shoulder only.

WhySign 433 on the right bans stopping at the right edge of the roadway and on the right shoulder. It does not affect the left side.