Earlier quoted context omitted.
There are several million truckers in the U.S., so it's somewhere around 1% (but it's probably less than 2%). I guess there are probably lots of delivery drivers, but those vehicles will still need tenders (at least until robots can do the last 100 feet of the delivery).
The "issue" is probably not for the general workforce, but it will significantly reduce the number of not-so-qualified jobs. According to a quick googling "1 in 15 worker in a long truck driver according to the ATA" [1]. But this is expected that automation tend to reduce these kind of jobs first. [1] http://truck-driver-salary.org/how-many-truck-drivers-are-th...
I'm sure it will create lots of turmoil if truckers are put out of work. But there is already an enormous amount of turmoil in the employment market (for lots of reasons). Especially in the part of the employment market that truckers participate in.