Yes, this is standard in Canada as well. Most systems in our area are just using CO combo detectors, usually Notifier, and even then, the Garage has it’s own CO system.
The CO system in the garage is also designed with the exhaust fans, so when the PPM of gases or CO gets high enough, it will trigger the large exhaust fans in the garage, which will start to flush out all the air. Majority of them are separated from the FACP, newer and current buildings will have monitor modules for them, that will latch a supervisory on the FACP. Some will also have signals, a newer building I was in had white System Sensor Strobes around labelled ‘CO’.
Exactly the reason, the regular CO detector would go off constantly due to cars starting up and driving by and other things. Hence a smarter system that can detect the different gases and actually know if they are at a dangerous level or not.