Where is this law hiding in the HTA? and does it pertain to these covers?
If you stop and read the labels on most aftermarket accessories they will say "check local laws" or something close to that. Just because CT sells them does not make them legal.
http://www.OHTA.ca OR http://www.OntarioTrafficAct.com
If this plate is considered obstructed, what IS allowed in terms of a plate frame? I find the legislation pretty unspecific in terms of what is and is not allowed. From what I've read, and I'm no lawyer, but as long as the numbers are not obstructed it should be ok...
What about something like this: