Less transparency into what their peers are making is one possible driver, suggests Hired's lead data scientist, Jessica Kirkpatrick.
For them, the new laws mean that any police stop, whether for a violation that caused an accident, or for a broken taillight or another driver's mistake, can lead to deportation.
He also said Uber's policy is in Uber's name, not the driver's, which could lead to legal complications.
There was one driver change going into the event: the Footwork team's lead driver, Gianni Morbidelli, was replaced by compatriot Massimiliano Papis, an International Formula 3000 race winner who had also been the test driver for Team Lotus in 1994, before the outfit withdrew from the sport ahead of the 1995 season.
"During the ride, it's OK if it's boring, because that means it's safe," says Brian Torcellini, Google's lead test driver and the man responsible for training other drivers not to drive.
Just as the head boy is always there on the first day of term, staking his claim in the common room, so it falls on a team's lead driver to set the pace at the first test.
With Daniel Ricciardo stepping up to take on the responsibility as Red Bull's lead driver, Daniil Kvyat makes the jump up from Toro Rosso to partner the Australian, who won three races last time out and was the only non-Mercedes driver to stand on top of the podium in 2014.
With the approach of the Monza race, company officials acknowledge, there has been the annual round of fractiousness among engineers, racing team officials and Ferrari executives — and, this year, a rare rebuke for the Formula One team's lead driver, the Spaniard Fernando Alonso, from the usually mild-spoken company chief, di Montezemolo.
Sutil, who will be in his eighth season in Formula 1, effectively replaces Hulkenberg as Sauber's lead driver.
