I've noticed that on runways at Canadian airports, runway numbers are painted noticeably smaller than runway numbers at airports pretty much anywhere else. For instance, here's the beginning of runway 32 at Ottawa Airport in Canada, and here's the beginning of runway 32 at Buffalo Airport in New York. Or the beginning of runway 32 (left) at Madrid airport in Spain. Does anyone know why the runway numbers are printed smaller? Wouldn't it be best for them to be nice and large so as to be readable from the air?