I think
Traveller is a perfect example of a classic adventure game (CAG) in no small part due to the many procedural generators built into the system: star trading, mercenary tickets, fleet operations, asteroid mining, planetary surveys, on and on. This is one of the reasons it's so well suited to solitaire play.
I had a back-and-forth with one of the proponents of CAG a few months ago on our blogs; rather than rehash it all here, here's my takeaway: I think roleplaying is a natural outgrowth of adventure gaming and that the hobby gets the process backward by putting roleplaying - playing a character - ahead of the adventure - playing a game.
Another GDW game is my exemplar of this: the swashbuckling dueling game,
En Garde! EG started life as a set of man-to-man dueling rules, but as players played, they got curious about their characters' lives outside of the times they crossed steel. The result was a series of procedural generators for clubbing, wenching, and campaigning with the goal of advancing socially.
I've been playing these silly games for the better part of forty-seven years now, and from my experience, roleplaying - making decisions about your 'playing piece' in the game - tends to arise organically out of actual play. Ask yourself the question, 'What would my character do?' enough times and a persona emerges. Think about
Traveller's lifepaths: you're making in-character decisions from the moment you choose a service and a skill table to roll on, and by the time you're done, it's not difficult to think of your character in terms of what they want and what they're willing to do to get it. A personality emerges, no play-acting required.
Now, I personally enjoy that play-acting aspect too: I'm solitaire playing a
Beltstrike campaign right now, with a husband-and-wife team originally inspired by Virgil and Lindsey Brigman from
The Abyss. He's a retired Belter, she's an ex-Scout, and together they're trying to get rich at the ass-end of the Imperium. Most of 'playing the game' is
Bookkeeping & Balance Sheets - fuel consumption, stores, sensor readings, &c - but just for fun I write little short stories for myself recounting conversations between the two of them, because it's fun to explore what's going on in their heads as the procedural aspects of playing the game tap more and more into their decision making.
Anyway, here are links to the blog posts between me and EOTB about what adventure gaming is, if you're curious - I strongly recommend reading what EOTB has to say about this:
What is Classic Adventure Gaming? (EOTB at
Chronicled Scribblings of the Itinerant Overlord)
Make Mine . . . Adventure Roleplaying?! (me at
Really Bad Eggs)
No Roleplaying?!? (EOTB again)
More Adventure Gamer Than Not (me again)