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Haas and Williams have become the latest teams to incorporate T-wings onto their 2017 challengers as the first day of testing began in Barcelona.
Following a week of a car launches, the next step on the road to the new 2017 season is the first winter test in Barcelona.
Williams officially presented their FW40 to the world on Saturday, two days before the start of pre-season testing.
Felipe Massa will put Williams’ new FW40 through its paces on the opening day of pre-season testing.
Paul Di Resta has been retained by Williams to be their reserve driver behind Felipe Massa and Lance Stroll for the 2017 season.