That’s strange. The times I’ve taken the Pulse from UTSC, I’ve been able get off at Port Union. I guess the operators I had didn’t bother enforcing that.It depends. If you are going to Pickering you can get on at Port Union
If you are heading to the university you can only get off.
I've seen people ask to get off at Port Union heading to Pickering but the driver refuses and takes them to Altona.
In any case, I think the rule is a bit silly. People have perfectly valid reasons to take the 900 to Port Union since the 95 stops short at the 401. Though I saw a proposal recently that could change that in the future.