The sign "Parking on sidewalks, partially in the driving lane on the right" indicates that parking is allowed for vehicles to partially occupy the sidewalk while still being in the driving lane on the right side of the road. This sign typically suggests that drivers can park their cars in a way that they do not entirely obstruct the sidewalk but might still use part of the driving lane for their vehicle.

In terms of regulations, it is important for drivers to ensure that their parked vehicle does not impede pedestrian traffic on the sidewalk. Moreover, they should be cautious that their vehicle position does not obstruct other vehicles or create a traffic hazard. It is advisable to check for any additional local rules or restrictions that may apply, as local ordinances can impact parking legality in certain areas.

If you have any more specific questions or need further clarification, feel free to ask!