Final answer:
The bus companies, Greyhound Lines, Inc. and Trailways Transportation System, likely preferred the broader market definition of "the market for intercity transportation" to lessen antitrust concerns by showing they are part of a larger competitive landscape.
Step-by-step explanation:
According to the Transportation Code, a motor vehicle designed, used, or maintained primarily to transport property is the definition of a commercial vehicle. Now, considering the scenario some years ago when Greyhound Lines, Inc. and Trailways Transportation System wished to merge, the definition of the market would be crucial. The two possible market definitions were "the market for intercity bus service" and "the market for intercity transportation", which includes personal cars, car rentals, passenger trains, and commuter air flights.
The bus companies likely preferred the broader definition of "the market for intercity transportation", which encompasses all forms of travel between cities. This is because a broader market definition would make the merged entity seem like a smaller player in a vast industry, which could alleviate antitrust concerns and suggest less market concentration. Highlighting the competition from personal cars, car rentals, trains, and flights would help argue that the merger wouldn't dominate the market, hence potentially securing regulatory approval for the merger.