Do You Have to Stop Twice at a Stop Sign?
No, most often stopping behind another car at a stop sign does not count as your legal stop.
According to Section 186 of the Motor Vehicle Act, you must bring your vehicle to a complete stop at a specific location—the stop line, crosswalk, or intersection edge—regardless of whether you already stopped behind another vehicle.

When waiting at a red light, how much space should you leave between your vehicle and the car ahead? A common rule of thumb is to ensure you can see the rear tires of the leading vehicle touching the pavement. However, when a multi-vehicle chain-reaction accident occurs, failing to leave a wide gap does not automatically make you legally liable for the damage.
Being stopped by the police is a high-stress moment. In my years on patrol, I saw it all: drivers slamming on their brakes in the middle of a live lane, and others who drove for kilometres, totally oblivious to the light show behind them.
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.
I am occasionally asked about the practice of left foot braking. The usual justification given for this is that the brakes may be applied more quickly because the left foot is ready while the right foot is busy with the accelerator pedal. While there are different schools of thought on whether this is appropriate for highway driving it may not be a good idea for the average driver.
I have noticed many drivers stopping at a red light several feet behind the car in front. Having asked my daughters who had recently passed their driving exams about this and both told me that their instructor had told them, even when stopped, they must leave at least one car length distance behind the car in front.
We've all seen it and I'll bet that we all talk about them, drivers who race us to the next red light. Here they come, weaving through traffic, going over the speed limit and pass by us just in time to stop for the same red light that we do. These drivers put us all at risk to gain nothing and demonstrate their inability to plan ahead.