Just based on my own sense, most residents are not conscious of parked vehicles on their street, unless there are very many, "oh someone is having a party' or the vehicle is unusual, 'gee there is an ambulance on the street' or the car impedes them. 'I cannot get out of my driveway'.
Secondly, most people cannot identify makes and models and colors very well especially in the dark.
'It was a black Mercedes, but it might have been dark grey, dark green, dark brown, or dark blue. It could have been an Audi, or a Lexus or Chrysler'. How many Mercedes and similar shaped cars, in dark colors, are in the Ontario database? Thousands, hundreds of thousands?