Can You Fail Your ICBC Road Test for Driving Too Slowly?
Yes, you can absolutely fail an ICBC road test for driving too slowly. While many examinees focus entirely on avoiding a speeding ticket, driving well under the posted speed limit indicates a lack of confidence, poor vehicle control, and a failure to maintain the flow of traffic. The exact ways driving too slowly leads to a failed test depend on the severity, the context, and how the behavior affects other road users.

Question: Is it legal to have a nitrous oxide system hooked up to a vehicle in British Columbia? If the bottle is detached from the system, is it legal? Does a DOT/WHMIS oxidizer symbol grant any right to transport it?

The short answer is no, you cannot safely or legally drive on public roads in British Columbia while your arm is immobilized in a temporary sling.
What is the purpose of completely coming to a stop at a 3 or 4 way stop when there are no vehicles or pedestrians near the intersection? A rolling stop should be sufficient, as MOST drivers including professional drivers never completely stop at stop signs. There are at least 3 good reasons for NOT coming to a complete stop. I cannot think of one good reason for coming to a COMPLETE stop.