It looked like just another big rig rolling down a Texas interstate, a sight that inspired a thousand country songs. But this delivery in May was different because there was no driver at the wheel.

“As the companies ramp up and gain confidence in their systems, they’ll reduce the number of vehicles for each monitor. Otherwise, they won’t have a business.” An undated photo provided by Aurora ...

There are active test runs in Texas, and a handful of companies are banking on making a big entry into the market as early as next year. By Jim Motavalli This is a return of Wheels, a column on the ...