Why is the trucking industry so fragmented?

The trucking industry is so fragmented because there is a low cost of entry. Almost anyone can start their own trucking company, no matter how small, and since it's vital for companies to get their logistics just right while keeping costs low, it's difficult for one or two companies to fully take over the market.

In addition, since truck drivers have the power to move from one company to another or to even start their own, drivers spur a significant amount of competition between trucking companies, and that variable isn't going away anytime soon.