I do find listening to a southern California speaker say "I was on 'the' 10" is physically stressful, as it expands to "I was on the [part of Interstate Highway

I do find listening to a southern California speaker say "I was on 'the' 10" is physically stressful, as it expands to "I was on the [part of Interstate Highway] 10 [which is a limited-access highway ['freeway'] but because Interstate 10 is an Interstate Highway, that's all of it.]" Just like you don't get your kicks on "the" Route 66, anywhere else we say "I was on I-10" or "I was on Route 10" or just "I was on 10." That may sound like a vent, but I am confirming a physical stress, at least from the constant repetition of such linguistic pain.