This lawsuit, filed by the EEOC, states that one terminal violated the civil rights act.
In my opinion, women drivers weren't always looking to break into the LTL side of driving.
I only remember one women at CF. She lasted 2 years after making the list. Other then her, I never remember seeing any other ladies doing LTL work. Road work, for sure.

Feds say trucking company refused to hire female drivers for more than 30 years
The Equal Employment Opportunity Commission (EEOC) filed suit against trucking company USF Holland, LLC on October 13, according to an EEOC news release.
The alleged violation occurred at the USF Holland terminal located in Olive Branch, Mississippi.
According to the EEOC suit USF Holland has employed “virtually no females as truck driver” at the Olive Branch location dating back to the opening of the terminal in 1986.

Authorities say that as of May 2016, more than 100 truck drivers were employed at the Olive Branch location and none were women.
“…Qualified women with extensive truck driving experience have applied over the years, but even when the women’s qualifications were equal or superior to those of male applicants, Holland hired men instead of women,” the EEOC alleges.
Hiring discrimination based on sex is a violation of Title VII of the Civil Rights Act of 1964.
Official government news release: