Under what condition may you park in a loading zone?

Parking in a loading zone is specifically designated for the purpose of loading and unloading goods or passengers. The correct answer outlines that you may park in a loading zone to unload, but you cannot leave the vehicle unattended for more than five minutes. This rule ensures that the loading zone remains available for its intended purpose, preventing congestion or obstruction for other vehicles that need to load or unload.

Conditions like time limits or being during specific hours may apply to loading zones in general, but the critical aspect is the requirement of active loading or unloading and not leaving the vehicle unattended, which aligns with traffic regulations designed to maintain order and safety on the roads.