If you like the greengrowers' apostrophe,

[Laurence Horn]

you'll love the highway signers' apostrophe.  The former is, of
course, that used for plurals in signs and elsewhere: "Fruit's and
Vegetable's".  The latter is for the third person singular, as this
one just spied on the on-ramp of Exit (Entrance?) 60 of the Merritt
Parkway in Connecticut:

Right Lane End's

Other sightings/citings?

larry