The driver shortage is a legitimate crisis and was the cause of huge rate increases last year. Driving a truck is a difficult job and fewer people are choosing it as a career path. [0]

“Regulatory constraints” refers to FMCSA’s hours-of-service rules, the legal limit to how many hours a driver may operate a truck in a given day. [1]

[0] https://www.npr.org/2018/01/09/576752327/trucking-industry-s...

[1] https://www.fmcsa.dot.gov/regulations/hours-service/summary-...