(There are exceptions, of course, A6000 would be read as "ay six thousand").
Presumably this is USA-ism noone bothered to fix.
"Four forty" is a better way to say it than "Four hundred forty" because the hundreds place is used to denote branches off the main interstate. I440 should attach to I40 in at least two places based on its number. And checking it on a map, it does look like I440 is a beltway through Raleigh.
Also, I can see an I540, which means a spur off of I40 that. And you can see that I540 connects to I40 in one spot and deposits you near I87.
But I wonder if that's because I'm from a part of England where the first digit is large (>4). I can see A1066 is more likely to be "ay ten sixty-six".
Siri: "Now playing one thousand and ten wins."
Or even worse, when I ask her to play the radio station 2GB in Sydney, known as "two gee bee, eight seven three."
Siri: "Now playing two gigabytes eight hundred and seventy three."
true 'mericans don't even know how to pronounce-out numbers that bigly
here in california there is this delightful local custom to give the freeway some random place name that changes every two miles, but give all the signs a number. or vice versa.
so it sounds like: "turn north on the rancho-el-coronado-pacifico-jackson expressway" which means turn "physically east on the 610" because it's actually north-south, but run's east-west "logically".
then for extra fun, add state highway numbers that overlap the us freeway numbers and use lots of proper nouns. as in "a crash occurred at the interchange of the northbound 415 and the 188 at the south 67 jason plotz memorial parkway on the escobar-de-los-muertos exit headed eastbound". i don't even know what i just said, but at least twenty commuters reading this just rerouted to avoid this mess.
Numerals are symbolic representations using digits, but may or may not have numeric properties.