This is heavily location-dependent. I grew up one province over, and currently live in Alberta, Canada. Depending on how far one takes the term "modified" (whic

This is heavily location-dependent. I grew up one province over, and currently live in Alberta, Canada. Depending on how far one takes the term "modified" (which I take to mean anything not road-legal), it could literally be every other car in the province. I'm sure half the people reading this won't agree, and chalk it up to confirmation bias. But between tinted front driver / passenger windows, license plate "covers" that attempt to defeat speed cameras, lift kits (leading to bumpers above maximum height), improperly-aimed aftermarket lights, and more, I'd be surprised if it was less than 40% of the vehicles on the road.