If you can identify one house on my block, you can figure the addresses for any of them: the numbering is consistent each lot west is plus four and usually the number is actually readable. This is not, however, the case everywhere:
Older son is a pizza delivery guy. He routinely sees what the paramedics see: no house number, confusing house numbers, illegible house numbers, dark brown house numbers on black backgrounds, white house numbers on cream backgrounds, house numbers twenty feet off the ground where you would never look, house numbers painted on the curb with cars parked over them, house numbers so small they can’t be seen from the street, house numbers that appear to have been installed at random; the list is endless. The pizza guys would like to find your house quicker as time is money for them. The ambulance guys would like to find your house quicker as they hope to save your life. The FedEx guy and the UPS guy would like to find your house quicker too. So do plumbers, electricians, paper boys, and furniture delivery guys.
I should state here that when I took over the palatial estate at Surlywood, there were two sets of numbers, neither of which passed muster: a set of chrome digits over the garage door, fine once, not so fine once new guttering was installed just over it; and a set of black digits on a brown background, not readable except under very specific lighting conditions.
I toyed with moving the black digits to a pink background, but ultimately decided to install a vertical plaque, black on white, 19 x 4 inches, just east of the garage door. It is not as handsome as I thought it might be, but it’s readable.
On the curb? One set of digits painted on each of the two curved sections, where it takes considerable effort to block them with cars.
And I should probably admit that maybe my block is not so easy after all: the numbering is as I stated, but there are eight houses on the south side of the street, only four on the north. This seems to baffle some people, even when they can read the digits.