General Motors' CEO has said layoffs announced at the company's self-driving Cruise unit were "prudent" but insisted she saw a "huge opportunity" for its vehicles to move both people and packages.

"We see a huge opportunity to move people and that same vehicle is very applicable to package delivery," Mary Barra said at a Bank of America investor conference, according to Reuters.

"We'll continue to aggressively work on both."

According to an internal email partially read to Reuters on Thursday, about 8% of Cruise staff would be cut, which amounts to more than 140 people.

The coronavirus pandemic had caused funding to dry up in the autonomous driving industry, Reuters noted.

Speaking to Bank of America, Barra repeated previous statements that GM remained "unwavering in our commitment to Cruise".

"I think what you saw them do was just a very prudent action," she said. "The tightening they just did was in non-technical areas" to focus more on developing self-driving technology.

Earlier, GM's chief financial officer said vehicle sales for the automaker and the US auto sector were trending in a positive direction as the sector recovered from the coronavirus pandemic.

"Early days, but we're seeing some positive signs in the first two weeks of May on the retail side," CFO Dhivya Suryadevara said during a webcast of a Goldman Sachs investor conference, according to Reuters.

A GM spokesman confirmed to Reuters she was speaking about both GM and industry demand.

Auto sales globally, including in the United States, were hurt as the COVID-19 virus shut down dealers, but markets have begun to reopen. GM is set to reopen "a majority of our operations" [this] week, Suryadevara said.

GM tracks vehicle sales on a daily basis and is in constant contact with its US dealers, tracking things like changes in preference including the growing market share for pickup trucks, she said.

As for the restart scheduled for today, Monday 18 May, some industry officials had worried delays in Mexico could lead to US assembly plants shutting back down due to a shortage of parts from south of the US border, Reuters said.

"The situation will be fluid leading up to the restart," she said. "It is clearly an interconnected system across US, Mexico and Canada that we're working with all the governments and the stakeholders to bring confidence on the way we're restarting and our safety protocols as well."