This is obviously a post-modern meta-composition, where the juxtaposition of the very prominent multiple choice "Public Footpath" signs are a reference to the many and varied ways one may set off on one's path in life (albeit slowly and by definition, lacking in a definitive destination), but then the artist, by placing the iconic Type 993 variant of the evergreen 911 fully front and centre, forces us to conclude that the very point of the work is that the only automotive steed, indeed, the only one Porsche, for the journey is the last of the air-cooled.
Once we realise the two "OUT" signs are facing towards us, we see that the implication is that the 993, as subject of the piece, is very much "IN" (both an allusion to its European roots and the ease at which in its day, entire continents could be driven without a single fence or wall to restrict our freedoms, and the current, possibly ephemeral, trendiness of the vehicle - this is also writ large by the artist's choice to use the wide-body model as his vehicular focal point).
The desaturation of the eponymous "Post-Box red" outside the safety and security of the provincial car park setting can only add to a suggestion of emasculation for any of those who find themselves "OUTSIDE" the air-cooled circle, and that the artist is worried the message might not get through.
The inclusion of a lychgate and generic religious obelisk looming in the background only increases the viewers unease about their own mortality and their final destination irrespective of the road they actually travel (that anxiety heightened by the fact we can't see the sign that points away from the viewer on the far right).
The overarching message we can realistically infer from the composition is that it is only through the reassurance and comforting of a 993 close at hand that we can truly traverse the journey through life.