In the US, some have failed, some have worked. In my home state of Maryland, the PPP (P3) for redeveloping the Travel Plazas along I-95 is often cited as a success story and they are indeed widely considered top notch rest stops. It's a small-ish thing, but it did work.

https://mdta.maryland.gov/Partnerships/tp3Overview.html

I don't know enough to say if Seagirt is considered a success but I do know Baltimore's port does very well. The Purple Line is/was a failure.