When is it permissible for a driver to pass a streetcar?

Answer: C — When the road is a one-way street

Passing a streetcar is permissible when driving on a one-way street because, in this scenario, there are suitable conditions for safely maneuvering around the streetcar that may be stopped and boarding or discharging passengers. Since traffic on a one-way street flows in a single direction, it allows drivers to pass without the complications that may arise on a two-way street, where there could be oncoming traffic or other potential hazards. In contrast, on two-way streets, passing a streetcar can present challenges including the presence of vehicles coming from the opposite direction and the necessity to navigate carefully to avoid obstructing those vehicles or pedestrians. Passing on the right side is also a restriction that is often placed in various regulations, indicating that drivers must yield to the passengers safely getting on or off the streetcar. Therefore, only on one-way streets do drivers have the clearer and safer option to pass when appropriate.