Route 440 is not the only place no destinations are shown for the GS Parkway at major highway interchanges. Another is I-80 in Saddle Brook which just shows North and South; period. Ditto for the I-280 interchange in East Orange and the I-78 interchange further south.
Maybe they are afraid that posting destinations will result in truckers following those signs onto the restricted Parkway.
Yup. The Garden State Parkway was never signed as a connecting freeway from other freeways. East Orange from I-280 signs it with Oraton Parkway ( is Service Road) and I-80 signs it with Saddle Brook, which is via an exit to Pehl Avenue. I-78 uses redundant text. The New York Thruway uses New Jersey, as New York rarely likes to acknowledge that NJ has cities. Only recently was Newark added to I-95 in The Bronx as it was always New Jersey.
However, back to The Parkway, very rarely were control cities used for ramps including the original free NJDOT part in North Central Jersey. Maybe a few like US 1 in Fords until the SB 130 to NB US 1 was added where Newark/ New York got removed when Newark was added as a 130 NB control city.
Toms River on NJ 37 did have them, but I believe it was because US 9 is concurrent with it there.