I think it's just amazing that Spence got Brian De Palma to direct this impressive video in his trademark Hitchcockian style!
Note the extended single shot sequence, ala Hitch's Rope (or in De Palma's case, the dazzling 12 minute opening tracking shot in Snake Eyes).
Spence's glasses as always frame his journey, in this case reflected through the prism of a reverse image -- the dominant motif of the rear view mirror.
And his glasses -- always those glasses -- turn around on us as we turn around on them, here defined (and limited) through the triple refraction of that ever-present mirror. Yet the road beckons just beyond our grasp.
It's as the viewer's perspective is skewed, off in degrees, an image once, twice removed and perhaps inverted still.
Do we know who Spence is? Do we know who we really are?
The allusions to Rear Window are obvious but in a way intriguing in this context -- just who is watching who?
And much as the audience in Rear Window is confined to the same wheelchair that shackles Jimmy Stewart, so too are we confined to the back seat, a mere traveler, maybe even a voyeur -- but surely not a companion.
In the end, it seems, we are truly alone.