1988 Cadillac Voyage Concept Car -  A Spirited Look Toward the Future Brochure. Original. The Spirit of Cadillac Moves Boldly Ahead with the Voyage Concept Car in black pearl with lower body in hand-finished gray-coated aluminum. Voyage was more than a stylist's dream come true. It was a functional, working prototype test platform where many of Cadillac's newest concepts in aerodynamic design, performance, handling, comfort and convenience were being reached and developed. Specifications. Very good condition.