These on-demand freight services are used by less than 5 percent of U.S. trucking lines, but the industry is getting a big push from investors. Hundreds of millions of dollars are going into dozens of freight tech start-ups, including Transfix, Loadsmart, Convoy, Doft, Cargo Chief, TugForce, HaulHound, Parade, ShipLync, uShip and Flexport, which has raised $94 million over the past several years.

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