I've lived here 20 years and I've never heard anyone, at any point, call it "The 95." It's "95", "I-95", or "128."

The reason that highways in CA are prefixed with "The" is because they all had names before the interstate highway system gave them numbers. so, it's called "the 5" because it used to be called "The Golden State freeway" and "the San Diego Freeway". That would hold in MA for our named road, The Mass Pike, but here the article doesn't transfer to the number, so if you say "The 90" people will look at you like you just fell off the turnip truck.