On which streets is parking on the left side permitted?

Parking on the left side is permitted on both one-way streets and streets with streetcar tracks because these scenarios often allow for safe and practical parking options. On one-way streets, traffic flows in a single direction, making it safe to park on either side without obstructing the regular flow of traffic.

In the case of streets with streetcar tracks, parking on the left side may be allowed as long as it does not interfere with the operations of the streetcars. The purpose of this parking rule is to maximize the use of available roadway space while ensuring safety for all roadway users, including motorists and public transport.

This option includes conditions that account for urban layouts where maintaining traffic flow and supporting public transportation effectiveness is crucial. The other options do not capture the same breadth of scenarios where left-side parking is permissible, particularly in relation to streetcar tracks, which is a significant consideration in certain regions.