https://www.google.com/maps/@42.3709859,-71.2678426,3a,37.5y,10.56h,92.38t/data=!3m6!1e1!3m4!1sdORZBkt4riIaSedqbkOUYA!2e0!7i16384!8i8192?entry=ttu
The above link leads to a Street View photo of the split in the off-ramp from northbound I-95/Route 128 to US 20 in the west suburbs of Boston; as you can see, there are four destinations listed on the signage - two in each direction - all of which start with the same letter: namely, Wayland, Weston, Waltham, and Watertown.
Throughout the country, where else have you seen a set of signs on the same gantry that show three or more town names that begin with the same letter? Where have you seen one with the most such town names listed?
Québec has just gotta hold the record for this, with all the St_____ destinations.
I-80 WB at the MacArthur Maze in Oakland (https://www.google.com/maps/@37.8335795,-122.2947905,3a,15y,163.69h,97.11t/data=!3m6!1e1!3m4!1ssTiMYH9CMEau0t4dtUTYLg!2e0!7i16384!8i8192?entry=ttu) has lots of S's well-represented: San Francisco, San Jose, and Stockton.
Going EB at the same location (https://www.google.com/maps/@37.8335795,-122.2947905,3a,15y,163.69h,97.11t/data=!3m6!1e1!3m4!1ssTiMYH9CMEau0t4dtUTYLg!2e0!7i16384!8i8192?entry=ttu), you get Sacramento, San Rafael and Stockton.
And coming NB on I-880 (https://www.google.com/maps/@37.8145715,-122.3002324,3a,44.6y,51.53h,94.48t/data=!3m7!1e1!3m5!1sEVNqP6a6F2AtFGPorhqwOw!2e0!6shttps:%2F%2Fstreetviewpixels-pa.googleapis.com%2Fv1%2Fthumbnail%3Fpanoid%3DEVNqP6a6F2AtFGPorhqwOw%26cb_client%3Dmaps_sv.tactile.gps%26w%3D203%26h%3D100%26yaw%3D7.9650445%26pitch%3D0%26thumbfov%3D100!7i16384!8i8192?entry=ttu), it's the same as the last example, but with San Francisco replacing Stockton.